【JAVA_GUI】单文件 JAVA_GUI 矩阵链动态规划算法
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老师可萌可萌的~ 看下面的项目实验吐槽~
就是编界面挺恼火的……QtCreator的界面打死我都不想再碰第二次……以前的Bug制造出强大的心灵阴影
所以……废话不多说……START
项目要求
【重要部分代码说明】
for(int i = 1; i <= n; i++) { g.setFont(fontLetter); g.drawString("A", matrixXStart, YStart + di); matrixXStart = matrixXStart + 12; g.setFont(fontNumber); g.drawString(String.valueOf(i), matrixXStart, YStart + di); matrixXStart = matrixXStart + 10; g.setFont(fontLetter); g.drawString(": " + p[i - 1] + "*" + p[i] + " ", matrixXStart, YStart + di); matrixXStart = matrixXStart + di * 3/2; } 仔细看这里，所使用的是drawString(str,xpos,ypos),三个参数分别为字符串，x坐标和y坐标。有了这个是不是就跟在PPT里写字符串一样了呢~
for(int i = 1; i <= n; i++) { m[i][i] = 0; int x = polygonArrayM[i][i].xpoints[0]; int y = polygonArrayM[i][i].ypoints[0]; setColorAndFill(g, Color.GREEN, polygonArrayM[i][i]); setColorAndDrawStr(g, Color.BLACK, m[i][i], x, y, 10, 5); sleepAndPossiblePause(interval); } setColorAndFill，如同字面意思，把【Graphics g】，填充为某种颜色，第三个参数是polygon，就是我要画的是哪一个方块。setColorAndDrawStr则为填充颜色后把字符串（这里的m[i][i]是longlong型的）也扔上去。
以上两个为自写函数，但只是合并调用减少代码长度罢了，如下：
private void setColorAndFill(Graphics g, Color c, Polygon p) { g.setColor(c); g.fillPolygon(p); g.setColor(Color.BLACK); g.drawPolygon(p); } private void setColorAndDrawStr(Graphics g, Color c, Object value, int x, int y, int xDeviation, int yDeviation) { g.setColor(c); g.drawString(String.valueOf(value), x + xDeviation, y + yDeviation); } //睡眠并可能暂停 private void sleepAndPossiblePause(int interval) { try { Thread.sleep(interval); synchronized(so) { while(so.status.equals("1")) { so.wait(); } } } catch (InterruptedException e) { e.printStackTrace(); } } 这个很方便的暂停函数是借鉴来的，十分的方便，代码倒是相当短啦~不过用在小游戏什么的里面作为pause使用应该也相当不错的。
【源码】
package pack;import java.awt.Color; import java.awt.Container; import java.awt.EventQueue; import java.awt.Font; import java.awt.Frame; import java.awt.Graphics; import java.awt.Polygon; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Scanner;import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.WindowConstants; @SuppressWarnings("serial")public class MatrixChainGUI extends JFrame { int n;// Num of Rec int di;//Length of dia_ratio int XMStart;//M_Matrix left.xpos int YStart;//Matrix left.pos int xSStart;//S_Matrix left.xpos int rstStrXStart;//Answer_xpos Polygon[][] polygonArrayM;//m_Array Polygon[][] polygonArrayS;//S_Array int[] p; JPanel charPanel; @SuppressWarnings("rawtypes")JComboBox change; JButton calculate = new JButton("开始/暂停"); Container pane; DrawPolygon d;//drawP //Rst_ WriteAnswer DrawCalculateRst dr; Thread algThread; //Resume and Pause PauseOrResume pOR; Thread pORThread; SynObj so = new SynObj();//用以同步 int interval; //speed boolean awake = false;//init Font fontLetter = new Font("letter", 0, 18); Font fontNumber = new Font("number", 0, 10); Font fontBracket = new Font("number", 0, 17); @SuppressWarnings({ "unchecked", "rawtypes" })public MatrixChainGUI(int[] p, int di) { super(); n = p.length - 1; if(n <= 2) { JOptionPane.showMessageDialog(MatrixChainGUI.this, "矩阵数目最少为3", "", JOptionPane.ERROR_MESSAGE); System.exit(0); } this.p = p; this.di = di; XMStart = di/2; YStart = di * (n+2)/2; xSStart = XMStart + n*di; rstStrXStart = XMStart; polygonArrayM = new Polygon[n+1][n+1]; polygonArrayS = new Polygon[n+1][n+1]; pane = this.getContentPane(); d = new DrawPolygon(); d.setIgnoreRepaint(true); charPanel = new JPanel(); String str[] = { "1", "2", "3" }; change = new JComboBox(str); charPanel.add(new JLabel("速度：")); charPanel.add(change); charPanel.add(calculate); pane.add("South", charPanel); pane.add("Center", d); calculate.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { if(so.status.equals("0")) { pOR = new PauseOrResume(); pORThread = new Thread(pOR); pORThread.start();//pause of resume Thread if(change.getSelectedItem().toString().equals("1")) { interval = 1000; } else if(change.getSelectedItem().toString().equals("2")) { interval = 600; } else { interval = 200; } dr = new DrawCalculateRst(); pane.add(dr); algThread = new Thread(dr); algThread.start();//Calculate Thread } //judge status else if(so.status.equals("2") || so.status.equals("1")) { awake = true; } } }); } public class DrawPolygon extends JPanel { public void paintComponent(Graphics g) { super.paintComponents(g); //PAINT Matrix_M int outCount = 1; int q = 0;//纵坐标偏移单位 while(outCount < n + 1) { int inCount = 1; int p = 0;//横坐标偏移单位 int j = outCount, i = 1; while(inCount < n + 2 - outCount) { int X[] = {XMStart+di*p+di/2*q,XMStart+di/2+di*p+di/2*q,XMStart+di+di*p+di/2*q,XMStart+di/2+di*p+di/2*q}; int Y[] = {YStart-di/2*q,YStart+di/2-di/2*q,YStart-di/2*q,YStart-di/2-di/2*q}; polygonArrayM[i][j] = new Polygon(X,Y,4); g.drawPolygon(polygonArrayM[i][j]); p++; i++; j++; inCount++; } q++; outCount++; } g.drawString("Matrix M_ij\n(m)", XMStart + di * n/2 - 25 , YStart - di * (n + 1)/2); //Paint No. for(int i = 1; i <= n; i++) { int xl = polygonArrayM[1][i].xpoints[0]; int yl = polygonArrayM[1][i].ypoints[0]; int xr = polygonArrayM[i][n].xpoints[0]; int yr = polygonArrayM[i][n].ypoints[0]; setColorAndDrawStr(g, Color.BLACK, i, xl, yl, 0, -9*di/25); setColorAndDrawStr(g, Color.BLACK, i, xr, yr, 4*di/5, -9*di/25); } //Paint Axis int midv=n/2; int xj = polygonArrayM[1][midv].xpoints[0] -75; int yj = polygonArrayM[1][midv].ypoints[0] +25; int xi = polygonArrayM[midv+1][n].xpoints[0] ; int yi = polygonArrayM[midv+1][n].ypoints[0] + 25; setColorAndDrawStr(g, Color.BLACK, "Matrix M_ij\n(j)", xj, yj, 0, -di); setColorAndDrawStr(g, Color.BLACK, "Matrix M_ij\n(i)", xi, yi, di, -di); //Paint Matrix_S int outCount1 = 2; int q1 = 1;//纵坐标偏移单位 while(outCount1 < n + 1) { int inCount = 1; int p = 1;//横坐标偏移单位 int j = outCount1, i = 1; while(inCount < n + 2 - outCount1) { int X[] = {xSStart+di*p+di/2*q1,xSStart+di/2+di*p+di/2*q1,xSStart+di+di*p+di/2*q1,xSStart+di/2+di*p+di/2*q1}; int Y[] = {YStart-di/2*q1,YStart+di/2-di/2*q1,YStart-di/2*q1,YStart-di/2-di/2*q1}; polygonArrayS[i][j] = new Polygon(X,Y,4); g.drawPolygon(polygonArrayS[i][j]); p++; i++; j++; inCount++; } q1++; outCount1++; } g.drawString("Value Matrix of S", xSStart + di * (n + 2)/2 - 50, YStart - di * (n + 1)/2); //绘制s值编号 for(int i = 2; i <= n; i++) { int xl = polygonArrayS[1][i].xpoints[0]; int yl = polygonArrayS[1][i].ypoints[0]; setColorAndDrawStr(g, Color.BLACK, i, xl, yl, 0, -9*di/25); } for(int i = 1; i <= n - 1; i++) { int xr = polygonArrayS[i][n].xpoints[0]; int yr = polygonArrayS[i][n].ypoints[0]; setColorAndDrawStr(g, Color.BLACK, i, xr, yr, 4*di/5, -9*di/25); } int matrixXStart = XMStart; g.setFont(fontLetter); g.drawString("[CD's HINT]: \t [ Green ] Already Calculated ", matrixXStart, YStart + di*9/3); g.drawString("[IOTClass1]: \t [ Yellow] Now is Calculating ", matrixXStart, YStart + di*10/3); g.drawString("[20125209]: \t [ Pink ] Calculating Related", matrixXStart, YStart + di*11/3); for(int i = 1; i <= n; i++) { g.setFont(fontLetter); g.drawString("A", matrixXStart, YStart + di); matrixXStart = matrixXStart + 12; g.setFont(fontNumber); g.drawString(String.valueOf(i), matrixXStart, YStart + di); matrixXStart = matrixXStart + 10; g.setFont(fontLetter); g.drawString(": " + p[i - 1] + "*" + p[i] + " ", matrixXStart, YStart + di); matrixXStart = matrixXStart + di * 3/2; } } } public class SynObj { String status = "0"; } public class DrawCalculateRst extends JPanel implements Runnable { public void run() { synchronized(so) { so.status = "2"; } matrixChainMul(d.getGraphics()); } } public class PauseOrResume implements Runnable { public void run() { while(true) { while(!awake) { try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } } // Runtime Set if(so.status.equals("1")) { if(change.getSelectedItem().toString().equals("1")) { interval = 1000; } else if(change.getSelectedItem().toString().equals("2")) { interval = 600; } else { interval = 200; } synchronized(so) { so.status = "2"; so.notifyAll(); } } else if(so.status.equals("2")) { so.status = "1"; } awake = false; } } } //Main Algorithm Here public void matrixChainMul(Graphics g) { long[][] m = new long[n + 1][n + 1]; int[][] s = new int[n][n + 1]; for(int i = 1; i <= n; i++) { m[i][i] = 0; int x = polygonArrayM[i][i].xpoints[0]; int y = polygonArrayM[i][i].ypoints[0]; setColorAndFill(g, Color.GREEN, polygonArrayM[i][i]); setColorAndDrawStr(g, Color.BLACK, m[i][i], x, y, 10, 5); sleepAndPossiblePause(interval); } for(int l = 2; l <= n; l++) { for(int i = 1; i <= n - l + 1; i++) { int j = i + l - 1; m[i][j] = Integer.MAX_VALUE; int x = polygonArrayM[i][j].xpoints[0]; int y = polygonArrayM[i][j].ypoints[0]; int xs = polygonArrayS[i][j].xpoints[0]; int ys = polygonArrayS[i][j].ypoints[0]; setColorAndFill(g, Color.YELLOW, polygonArrayM[i][j]); setColorAndFill(g, Color.YELLOW, polygonArrayS[i][j]); sleepAndPossiblePause(interval); for(int k = i; k <= j - 1; k++) { int x1 = polygonArrayM[i][k].xpoints[0]; int y1 = polygonArrayM[i][k].ypoints[0]; int x2 = polygonArrayM[k+1][j].xpoints[0]; int y2 = polygonArrayM[k+1][j].ypoints[0]; setColorAndFill(g, Color.PINK, polygonArrayM[i][k]); setColorAndDrawStr(g, Color.BLACK, m[i][k], x1, y1, 10, 5); setColorAndFill(g, Color.PINK, polygonArrayM[k+1][j]); setColorAndDrawStr(g, Color.BLACK, m[k+1][j], x2, y2, 10, 5); long q = m[i][k] + m[k+1][j] + p[i-1]*p[k]*p[j]; if(q < m[i][j]) { m[i][j] = q; s[i][j] = k; } sleepAndPossiblePause(interval); setColorAndFill(g, Color.GREEN, polygonArrayM[i][k]); setColorAndDrawStr(g, Color.BLACK, m[i][k], x1, y1, 10, 5); setColorAndFill(g, Color.GREEN, polygonArrayM[k+1][j]); setColorAndDrawStr(g, Color.BLACK, m[k+1][j], x2, y2, 10, 5); } setColorAndFill(g, Color.GREEN, polygonArrayM[i][j]); setColorAndDrawStr(g, Color.BLACK, m[i][j], x, y, 10, 5); setColorAndFill(g, Color.GREEN, polygonArrayS[i][j]); setColorAndDrawStr(g, Color.BLACK, s[i][j], xs, ys, 10, 5); sleepAndPossiblePause(interval); } } g.drawString("最优的加括号的序列： ", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + 120; printRstSequence(s, 1, n, g); } //Paint Answer public void printRstSequence(int[][] s, int i, int j, Graphics g) { if(i == j) { g.setFont(fontLetter); g.drawString("A", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; g.setFont(fontNumber); g.drawString(String.valueOf(i), rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; System.out.print("A" + i + " "); } else { g.setFont(fontBracket); g.drawString("(", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; System.out.print("("); printRstSequence(s, i, s[i][j], g); printRstSequence(s, s[i][j] + 1, j, g); g.setFont(fontBracket); g.drawString(")", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; System.out.print(")"); } } //Set Sleep(Pause) Status private void sleepAndPossiblePause(int interval) { try { Thread.sleep(interval); synchronized(so) { while(so.status.equals("1")) { so.wait(); } } } catch (InterruptedException e) { e.printStackTrace(); } } private void setColorAndFill(Graphics g, Color c, Polygon p) { g.setColor(c); g.fillPolygon(p); g.setColor(Color.BLACK); g.drawPolygon(p); } private void setColorAndDrawStr(Graphics g, Color c, Object value, int x, int y, int xDeviation, int yDeviation) { g.setColor(c); g.drawString(String.valueOf(value), x + xDeviation, y + yDeviation); } private static class FrameShower implements Runnable { private final Frame frame; FrameShower(Frame frame) { this.frame = frame; } public void run() { frame.setVisible(true); } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { Scanner in=new Scanner(System.in); //矩阵行列数组 //int[] p = {27, 33, 20, 18, 15, 18, 25}; System.out.println("Please tell me how many matrix are there?(Recommend 6~15)"); int vnum=in.nextInt(); int [] p=new int[vnum+1]; System.out.println("Please input values of these Matrix Size:"); System.out.printf("(Hint: %d matrix need %d numbers)\n",vnum,vnum+1); for(int i=0;i<p.length;i++) { int tmp=in.nextInt(); if(tmp<=0){System.out.println("Invalid Input!");break;} p[i]=tmp; } int di = 50; int n = p.length - 1; MatrixChainGUI c = new MatrixChainGUI(p, di); c.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); c.pack(); c.setSize(di * (2 * n + 2), di * (n+2)/2 + 280); c.setResizable(false); c.setTitle("MatrixChain_DP By CD_20125209"); EventQueue.invokeLater(new FrameShower(c)); System.out.println("单文件JAVA_GUI矩阵链动态规划算法演示结束，友情提示：这个可以打高分^_^"); System.out.println("作者：陈点 物联网1班 20125209"); } }); } } 【运行演示】
【源码超·中文注释完全版】
package pack;import java.awt.Color; import java.awt.Container; import java.awt.EventQueue; import java.awt.Font; import java.awt.Frame; import java.awt.Graphics; import java.awt.Polygon; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Scanner;import javax.swing.JButton; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.WindowConstants; @SuppressWarnings("serial")public class MatrixChainGUI extends JFrame { int n;//矩阵个数 int di;//正方形斜对角线长 int XMStart;//m值菱形数组最左边的x坐标 int YStart;//菱形数组最左边的y坐标 int xSStart;//s值菱形数组最左边的x坐标 int rstStrXStart;//最优加括号矩阵链起始横坐标 Polygon[][] polygonArrayM;//m值菱形数组 Polygon[][] polygonArrayS;//s值菱形数组 int[] p; JPanel charPanel; @SuppressWarnings("rawtypes")JComboBox change; JButton calculate = new JButton("开始/暂停"); Container pane; DrawPolygon d;//画表格 DrawCalculateRst dr;//计算并向屏幕写结果的任务 Thread algThread;//计算向屏幕写结果的线程 PauseOrResume pOR;//暂停、恢复的任务 Thread pORThread;//暂停、恢复的线程 SynObj so = new SynObj();//用以同步 int interval;//计算速度 boolean awake = false;//暂停、恢复计算线程初始化为睡眠状态 Font fontLetter = new Font("letter", 0, 18);//字母字体 Font fontNumber = new Font("number", 0, 10);//角标字体 Font fontBracket = new Font("number", 0, 17);//括号字体 @SuppressWarnings({ "unchecked", "rawtypes" })public MatrixChainGUI(int[] p, int di) { super(); n = p.length - 1; if(n <= 2) { JOptionPane.showMessageDialog(MatrixChainGUI.this, "矩阵数目最少为3", "", JOptionPane.ERROR_MESSAGE); System.exit(0); } this.p = p; this.di = di; XMStart = di/2;//m值菱形数组最左边的x坐标 YStart = di * (n+2)/2;//菱形数组最左边的y坐标 xSStart = XMStart + n*di;//s值菱形数组最左边的x坐标 rstStrXStart = XMStart;//最优加括号矩阵链起始横坐标 polygonArrayM = new Polygon[n+1][n+1];//m值菱形数组 polygonArrayS = new Polygon[n+1][n+1];//s值菱形数组 pane = this.getContentPane(); d = new DrawPolygon(); d.setIgnoreRepaint(true); charPanel = new JPanel(); String str[] = { "1", "2", "3" }; change = new JComboBox(str); charPanel.add(new JLabel("速度：")); charPanel.add(change); charPanel.add(calculate); pane.add("South", charPanel); pane.add("Center", d); calculate.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { if(so.status.equals("0")) { pOR = new PauseOrResume(); pORThread = new Thread(pOR); pORThread.start();//启动暂停或恢复计算的线程 if(change.getSelectedItem().toString().equals("1")) { interval = 1000; } else if(change.getSelectedItem().toString().equals("2")) { interval = 600; } else { interval = 200; } dr = new DrawCalculateRst(); pane.add(dr); algThread = new Thread(dr); algThread.start();//启动开始计算的线程 } //若正在运行，则进入暂停状态;若已经暂停，则恢复 else if(so.status.equals("2") || so.status.equals("1")) { awake = true; } } }); } public class DrawPolygon extends JPanel { public void paintComponent(Graphics g) { super.paintComponents(g); //绘制m值表格 int outCount = 1; int q = 0;//纵坐标偏移单位 while(outCount < n + 1) { int inCount = 1; int p = 0;//横坐标偏移单位 int j = outCount, i = 1; while(inCount < n + 2 - outCount) { int X[] = {XMStart+di*p+di/2*q,XMStart+di/2+di*p+di/2*q,XMStart+di+di*p+di/2*q,XMStart+di/2+di*p+di/2*q}; int Y[] = {YStart-di/2*q,YStart+di/2-di/2*q,YStart-di/2*q,YStart-di/2-di/2*q}; polygonArrayM[i][j] = new Polygon(X,Y,4); g.drawPolygon(polygonArrayM[i][j]); p++; i++; j++; inCount++; } q++; outCount++; } g.drawString("Matrix M_ij\n(m)", XMStart + di * n/2 - 25 , YStart - di * (n + 1)/2); //绘制m值编号 for(int i = 1; i <= n; i++) { int xl = polygonArrayM[1][i].xpoints[0]; int yl = polygonArrayM[1][i].ypoints[0]; int xr = polygonArrayM[i][n].xpoints[0]; int yr = polygonArrayM[i][n].ypoints[0]; setColorAndDrawStr(g, Color.BLACK, i, xl, yl, 0, -9*di/25); setColorAndDrawStr(g, Color.BLACK, i, xr, yr, 4*di/5, -9*di/25); } //绘制i，j字母 int midv=n/2; int xj = polygonArrayM[1][midv].xpoints[0] -75; int yj = polygonArrayM[1][midv].ypoints[0] +25; int xi = polygonArrayM[midv+1][n].xpoints[0] ; int yi = polygonArrayM[midv+1][n].ypoints[0] + 25; setColorAndDrawStr(g, Color.BLACK, "Matrix M_ij\n(j)", xj, yj, 0, -di); setColorAndDrawStr(g, Color.BLACK, "Matrix M_ij\n(i)", xi, yi, di, -di); //绘制s值表格 int outCount1 = 2; int q1 = 1;//纵坐标偏移单位 while(outCount1 < n + 1) { int inCount = 1; int p = 1;//横坐标偏移单位 int j = outCount1, i = 1; while(inCount < n + 2 - outCount1) { int X[] = {xSStart+di*p+di/2*q1,xSStart+di/2+di*p+di/2*q1,xSStart+di+di*p+di/2*q1,xSStart+di/2+di*p+di/2*q1}; int Y[] = {YStart-di/2*q1,YStart+di/2-di/2*q1,YStart-di/2*q1,YStart-di/2-di/2*q1}; polygonArrayS[i][j] = new Polygon(X,Y,4); g.drawPolygon(polygonArrayS[i][j]); p++; i++; j++; inCount++; } q1++; outCount1++; } g.drawString("Value Matrix of S", xSStart + di * (n + 2)/2 - 50, YStart - di * (n + 1)/2); //绘制s值编号 for(int i = 2; i <= n; i++) { int xl = polygonArrayS[1][i].xpoints[0]; int yl = polygonArrayS[1][i].ypoints[0]; setColorAndDrawStr(g, Color.BLACK, i, xl, yl, 0, -9*di/25); } for(int i = 1; i <= n - 1; i++) { int xr = polygonArrayS[i][n].xpoints[0]; int yr = polygonArrayS[i][n].ypoints[0]; setColorAndDrawStr(g, Color.BLACK, i, xr, yr, 4*di/5, -9*di/25); } int matrixXStart = XMStart; g.setFont(fontLetter); g.drawString("[CD's HINT]: \t [ Green ] Already Calculated ", matrixXStart, YStart + di*9/3); g.drawString("[IOTClass1]: \t [ Yellow] Now is Calculating ", matrixXStart, YStart + di*10/3); g.drawString("[20125209]: \t [ Blue ] Calculating Related", matrixXStart, YStart + di*11/3); for(int i = 1; i <= n; i++) { g.setFont(fontLetter); g.drawString("A", matrixXStart, YStart + di); matrixXStart = matrixXStart + 12; g.setFont(fontNumber); g.drawString(String.valueOf(i), matrixXStart, YStart + di); matrixXStart = matrixXStart + 10; g.setFont(fontLetter); g.drawString(": " + p[i - 1] + "*" + p[i] + " ", matrixXStart, YStart + di); matrixXStart = matrixXStart + di * 3/2; } } } public class SynObj { String status = "0"; } public class DrawCalculateRst extends JPanel implements Runnable { public void run() { synchronized(so) { so.status = "2"; } matrixChainMul(d.getGraphics()); } } public class PauseOrResume implements Runnable { public void run() { while(true) { while(!awake) { try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } } if(so.status.equals("1")) { if(change.getSelectedItem().toString().equals("1")) { interval = 1000; } else if(change.getSelectedItem().toString().equals("2")) { interval = 600; } else { interval = 200; } synchronized(so) { so.status = "2"; so.notifyAll(); } } else if(so.status.equals("2")) { so.status = "1"; } awake = false; } } } //矩阵链乘法最优算序寻找算法 public void matrixChainMul(Graphics g) { long[][] m = new long[n + 1][n + 1]; int[][] s = new int[n][n + 1]; for(int i = 1; i <= n; i++) { m[i][i] = 0; int x = polygonArrayM[i][i].xpoints[0]; int y = polygonArrayM[i][i].ypoints[0]; setColorAndFill(g, Color.GREEN, polygonArrayM[i][i]); setColorAndDrawStr(g, Color.BLACK, m[i][i], x, y, 10, 5); sleepAndPossiblePause(interval); } for(int l = 2; l <= n; l++) { for(int i = 1; i <= n - l + 1; i++) { int j = i + l - 1; m[i][j] = Integer.MAX_VALUE; int x = polygonArrayM[i][j].xpoints[0]; int y = polygonArrayM[i][j].ypoints[0]; int xs = polygonArrayS[i][j].xpoints[0]; int ys = polygonArrayS[i][j].ypoints[0]; setColorAndFill(g, Color.YELLOW, polygonArrayM[i][j]); setColorAndFill(g, Color.YELLOW, polygonArrayS[i][j]); sleepAndPossiblePause(interval); for(int k = i; k <= j - 1; k++) { int x1 = polygonArrayM[i][k].xpoints[0]; int y1 = polygonArrayM[i][k].ypoints[0]; int x2 = polygonArrayM[k+1][j].xpoints[0]; int y2 = polygonArrayM[k+1][j].ypoints[0]; setColorAndFill(g, Color.BLUE, polygonArrayM[i][k]); setColorAndDrawStr(g, Color.BLACK, m[i][k], x1, y1, 10, 5); setColorAndFill(g, Color.BLUE, polygonArrayM[k+1][j]); setColorAndDrawStr(g, Color.BLACK, m[k+1][j], x2, y2, 10, 5); long q = m[i][k] + m[k+1][j] + p[i-1]*p[k]*p[j]; if(q < m[i][j]) { m[i][j] = q; s[i][j] = k; } sleepAndPossiblePause(interval); setColorAndFill(g, Color.GREEN, polygonArrayM[i][k]); setColorAndDrawStr(g, Color.BLACK, m[i][k], x1, y1, 10, 5); setColorAndFill(g, Color.GREEN, polygonArrayM[k+1][j]); setColorAndDrawStr(g, Color.BLACK, m[k+1][j], x2, y2, 10, 5); } setColorAndFill(g, Color.GREEN, polygonArrayM[i][j]); setColorAndDrawStr(g, Color.BLACK, m[i][j], x, y, 10, 5); setColorAndFill(g, Color.GREEN, polygonArrayS[i][j]); setColorAndDrawStr(g, Color.BLACK, s[i][j], xs, ys, 10, 5); sleepAndPossiblePause(interval); } } g.drawString("最优的加括号的序列： ", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + 120; printRstSequence(s, 1, n, g); } //打印加括号顺序 public void printRstSequence(int[][] s, int i, int j, Graphics g) { if(i == j) { g.setFont(fontLetter); g.drawString("A", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; g.setFont(fontNumber); g.drawString(String.valueOf(i), rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; System.out.print("A" + i + " "); } else { g.setFont(fontBracket); g.drawString("(", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; System.out.print("("); printRstSequence(s, i, s[i][j], g); printRstSequence(s, s[i][j] + 1, j, g); g.setFont(fontBracket); g.drawString(")", rstStrXStart, YStart + di * 2); rstStrXStart = rstStrXStart + di/4; System.out.print(")"); } } //睡眠并可能暂停 private void sleepAndPossiblePause(int interval) { try { Thread.sleep(interval); synchronized(so) { while(so.status.equals("1")) { so.wait(); } } } catch (InterruptedException e) { e.printStackTrace(); } } private void setColorAndFill(Graphics g, Color c, Polygon p) { g.setColor(c); g.fillPolygon(p); g.setColor(Color.BLACK); g.drawPolygon(p); } private void setColorAndDrawStr(Graphics g, Color c, Object value, int x, int y, int xDeviation, int yDeviation) { g.setColor(c); g.drawString(String.valueOf(value), x + xDeviation, y + yDeviation); } private static class FrameShower implements Runnable { private final Frame frame; FrameShower(Frame frame) { this.frame = frame; } public void run() { frame.setVisible(true); } } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { Scanner in=new Scanner(System.in); //矩阵行列数组 //int[] p = {27, 33, 20, 18, 15, 18, 25}; System.out.println("Please tell me how many matrix are there?(Recommend 6~15)"); int vnum=in.nextInt(); int [] p=new int[vnum+1]; System.out.println("Please input values of these Matrix Size:"); System.out.printf("(Hint: %d matrix need %d numbers)\n",vnum,vnum+1); for(int i=0;i<p.length;i++) { int tmp=in.nextInt(); if(tmp<=0){System.out.println("Invalid Input!");break;} p[i]=tmp; } int di = 50; int n = p.length - 1; MatrixChainGUI c = new MatrixChainGUI(p, di); c.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); c.pack(); c.setSize(di * (2 * n + 2), di * (n+2)/2 + 280); c.setResizable(false); c.setTitle("MatrixChain_DP By CD_20125209"); EventQueue.invokeLater(new FrameShower(c)); System.out.println("单文件JAVA_GUI矩阵链动态规划算法演示结束，友情提示：这个可以打高分^_^"); System.out.println("作者：陈点 物联网1班 20125209"); } }); } } ==== 部分非原创说明 ====
（以下提及的辅助函数中注释大多为xglv2013的函数自带注释）
此版本依照 software8_co的 Swing动态演示中的
· “线程”概念 （线程函数摘自网络教程）
· 三速切换控制 （此函数摘自xglv）
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