多窗体

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多窗体

多窗体，这是小编结合前面发的几篇而写成的。通过登录页面登录后，进入到另一个页面。java的窗体一般是通过 java.awt.* awt 这个类来实现的。

登录页面代码：import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.FocusEvent;import java.awt.event.FocusListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.JOptionPane;public class UserLogin implements ActionListener { Frame app = new Frame("登录窗体");   Label lblName = new Label("登录名:"); static TextField txtName = new TextField();     Label lblPass = new Label("密码:");  static TextField txtPass = new TextField();     //   新添加一个Button 按钮   Button bt = new Button("确定登录");   Button bt2 = new Button("退出登录");    public UserLogin(){ app.setSize(300, 200); app.setLayout(null);    lblName.setBounds(60, 50, 70, 20);  txtName.setBounds(135, 50, 100, 20);      txtName.addKeyListener(new KeyHandler());  txtName.addFocusListener(new FocusHandler());      lblPass.setBounds(60, 90, 70, 20);  txtPass.setBounds(135, 90, 100, 20);      txtPass.addKeyListener(new KeyHandler());   txtPass.addFocusListener(new FocusHandler());      app.add(lblName);   app.add(txtName);   app.add(lblPass);   app.add(txtPass);      // 将Button 按钮放入窗体中去。   app.add(bt);   app.add(bt2);   bt.setBounds(55, 140, 60, 30);   bt2.setBounds(182, 140, 60, 30);   bt.addActionListener(this);   bt2.addActionListener(this);     app.setLocation(200, 100);   app.setBackground(Color.orange);   app.setResizable(false);   app.setVisible(true); }public static void main(String[] args){UserLogin tft = new UserLogin(); }  public void actionPerformed(ActionEvent e){ Object ob = e.getSource(); if (ob == bt2){ System.exit(0); }  else if(ob == bt)   {                            new  ScrollbarTest();                            }    }}class KeyHandler implements KeyListener{@Overridepublic void keyTyped(KeyEvent e) {// TODO 自动生成的方法存根}@Overridepublic void keyPressed(KeyEvent e) {// TODO 自动生成的方法存根Object ob = e.getSource(); if(( ob == UserLogin.txtName )&&( e.getKeyCode() == 10 )){// System.out.println(UserLogin.txtName.getText()); } else if(( ob == UserLogin.txtPass )&&( e.getKeyCode() == 10 )){// System.out.println( UserLogin.txtPass.getText() ); }}@Overridepublic void keyReleased(KeyEvent e) {// TODO 自动生成的方法存根}   }class FocusHandler implements FocusListener{@Overridepublic void focusGained(FocusEvent e) {// TODO 自动生成的方法存根}@Overridepublic void focusLost(FocusEvent e) {// TODO 自动生成的方法存根Object ob = e.getSource(); if(( ob == UserLogin.txtName ) ){// System.out.println(UserLogin.txtName.getText()); } else if(( ob == UserLogin.txtPass ) ){// System.out.println( UserLogin.txtPass.getText() ); }}}

滚动条窗体页面 code：import java.awt.*;import java.awt.event.AdjustmentEvent;import java.awt.event.AdjustmentListener;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JOptionPane;public class ScrollbarTest implements AdjustmentListener,ActionListener {   Frame app = new Frame("滚动条");   // 三个标签数组 Label lblColor[] = {new Label("Red:"),new Label("Green："),new Label("Blue:")};       // 三个滚动条 Scrollbar  scbColor[] = { new Scrollbar(Scrollbar.HORIZONTAL,0,20,0,255), new Scrollbar(Scrollbar.HORIZONTAL,0,20,0,255), new Scrollbar(Scrollbar.HORIZONTAL,0,20,0,255),};                                                                                                      // Button 按钮    Button bt1 = new Button("提交");      Button bt2 = new Button("退出");       public ScrollbarTest(){       sbinit();       }               void sbinit(){      app.setSize(260,300);   app.setLayout(null);    // 设置滚动条和标签的大小   for(int k = 0;k<3;k++){   lblColor[k].setBounds(110, 60+60*k, 50, 20);   scbColor[k].setBounds(30, 85+60*k, 200, 20);   scbColor[k].addAdjustmentListener(this);   }          //  该for循环用来设置标签和滚动条的背景颜色     for(int i = 0;i<3;i++){     lblColor[0].setBackground(Color.red);     scbColor[0].setBackground(Color.red);     lblColor[1].setBackground(Color.green);     scbColor[1].setBackground(Color.green);     lblColor[2].setBackground(Color.blue);     scbColor[2].setBackground(Color.blue);     }                  //  三个标签和三个滚动条添加到窗体中。    for(int k = 0;k<3;k++){    app.add(lblColor[k]);    app.add(scbColor[k]);    }        bt1.setBounds(30, 250, 75,35);    bt2.setBounds(160, 250, 75,35);    bt1.setBackground(Color.orange);    bt2.setBackground(Color.MAGENTA);    bt1.addActionListener(this);    bt2.addActionListener(this);                    app.setLocation(200, 100);    app.setVisible(true);          app.setResizable(false);       app.setBackground(Color.gray);     app.add(bt1);     app.add(bt2);   }      public static void main(String[] args){ScrollbarTest sbt = new ScrollbarTest();sbt.sbinit();}@Override  public void adjustmentValueChanged(AdjustmentEvent e) {// TODO 自动生成的方法存根Object ob = e.getSource();if(ob == scbColor[0]){System.out.println(scbColor[0].getValue()+" ");}else if(ob == scbColor[1]){System.out.println(scbColor[1].getValue()+" ");}else if(ob == scbColor[2]){System.out.println(scbColor[2].getValue()+" ");}}  //  ActionEvent 事件 public void actionPerformed(ActionEvent e){ Object ob = e.getSource();  // 当点击退出按钮时，窗体就回退出。 if(ob == bt2){  System.exit(0); } else if(ob == bt1){ Object str = "选择你喜爱的滚动条？"; JOptionPane.showInputDialog(str); }    }}

注意，一般通过Button来实现第二个窗体或者第三个或者更多窗体。一般调用上级窗体的构造函数方法来实现

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