java中做一個(gè)按鈕，點(diǎn)擊按鈕后畫一個(gè)矩形的代碼怎么寫？

兄弟幫你寫了一個(gè)：

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import java.awt.Button;

import java.awt.Color;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.Random;

public class Print {

public static void main(String[] args) {

new Te();

}

}

class Te extends Frame implements ActionListener {

Color cc = Color.red;

int x = -20, y = -50;

Random r = new Random();

public Te() {

this.setLayout(null);

Button b = new Button("畫圓");

this.add(b);

b.setBounds(30,30,50,50);

b.addActionListener(this);

this.addWindowListener(new WindowAdapter () {

@Override

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

this.setBounds(200,200,500,400);

this.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

this.cc = Color.red;

this.x = r.nextInt(400);

do {

int x1 = r.nextInt(300);

this.y = x1;

} while (this.y 50);

this.repaint();

}

@Override

public void paint(Graphics g) {

Color c = g.getColor();

g.setColor(cc);

g.drawRect(x,y,50,50);

g.setColor(c);

}

}

Java中按鈕事件代碼 詳請(qǐng)見(jiàn)下面

很簡(jiǎn)單嘛，代碼如下

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

public class Test {

static JFrame jf1 = new JFrame("jf1");

static JFrame jf2 = new JFrame("jf2");

static JButton jb = new JButton("click");

public static void main(String[] args) {

jf1.add(jb);

jf1.setSize(200, 200);

jf2.setSize(200, 200);

jf1.setVisible(true);

jb.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

jf2.setVisible(true);

}

});

}

}

java中點(diǎn)擊一個(gè)按鈕彈出兩個(gè)輸入文本框的源代碼

寫了一個(gè)很簡(jiǎn)單的案例,可以參考和修改

import?java.awt.BorderLayout;

import?java.awt.GridLayout;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.JButton;

import?javax.swing.JDialog;

import?javax.swing.JFrame;

import?javax.swing.JLabel;

import?javax.swing.JTextField;

public?class?FromeDemo?extends?JFrame{

JButton?jbutton;

public?FromeDemo()?{

jbutton?=?new?JButton("彈出2個(gè)文本框");

jbutton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

JDialog?jd?=?new?JDialog();

jd.setBounds(320,?180,?260,?100);

jd.setTitle("彈出文本框");

jd.getContentPane().setLayout(new?GridLayout(2,?2));

jd.add(new?JLabel("文本框一"));

jd.add(new?JTextField(80));

jd.add(new?JLabel("文本框二"));

jd.add(new?JTextField(80));

jd.setModal(true);//確保彈出的窗口在其他窗口前面

jd.setVisible(true);

}

});

add(jbutton,BorderLayout.SOUTH);

setBounds(300,?100,?320,?320);

setTitle("測(cè)試");

setDefaultCloseOperation(EXIT_ON_CLOSE);

setVisible(true);

}

public?static?void?main(String?args[])?{

new?FromeDemo();

}

}