JAVA之多线程入门和自动滚轮

来源：互联网发布：达芬奇调色软件价格编辑：程序博客网时间：2024/06/09 18:51
start实现每1s递增的在textarea打印一个数字，end实现终止start的线程
import java.awt.BorderLayout;import java.awt.Color;import java.awt.Container;import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.Point;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.net.URL;import java.util.Random;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JProgressBar;import javax.swing.JScrollPane;import javax.swing.JTable;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.SwingConstants;import javax.swing.WindowConstants;import javax.swing.table.DefaultTableModel;public class test extends JFrame{JTextArea jt = new JTextArea(10,10);JButton jb_s = new JButton("start!");JButton jb_e = new JButton("end!");JScrollPane js = new JScrollPane(jt);Thread t1 ,t2;int count  = 0;boolean flag = true;public test(){init();jb_s.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent arg0) {// TODO Auto-generated method stubflag = true;jt.setLineWrap(true);jt.setEditable(false);t1 = new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubwhile(flag){jt.append(count++ + " \n");//jt.setCaretPosition(jt.getText().length());//方法1：自动滚动到textarea的底部//js.getViewport().setViewPosition(new Point(0,jt.getLineCount()*20));//方法2try {Thread.sleep(100);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}});t1.start();}});jb_e.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent arg0) {// TODO Auto-generated method stubt2 = new Thread(new Runnable() {@Overridepublic void run() {// TODO Auto-generated method stubflag = false;}});t2.start();}});}public void init(){setLocationRelativeTo(null);Container con = getContentPane();con.add(js,BorderLayout.NORTH);JPanel jp = new JPanel();jp.setLayout(new FlowLayout());jp.add(jb_s);jp.add(jb_e);jp.setOpaque(false);con.add(jp,BorderLayout.SOUTH);setVisible(true);setSize(500,300);setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);}public static void main(String[] agrs){new test();}}
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