寫壹個java程序，使其畫壹個正方形並改變它的顏色（每秒鐘改變壹次）。求完整代碼謝謝

按照妳的要求,編寫的Java程序如下

import?java.awt.Color;

import?java.awt.Graphics;

import?javax.swing.JFrame;

public?class?F?extends?JFrame?implements?Runnable{

Color[]?colors?=?{Color.red,Color.orange,Color.yellow,Color.green,Color.cyan,Color.blue,Color.magenta,Color.black};?

int?i=0;

F(){

setTitle("變色正方形");

setSize(400,?400);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setLocationRelativeTo(null);

setVisible(true);

}

public?void?paint(Graphics?g){

g.setColor(colors[i]);

g.drawRect(100,100,200,200);

}

@Override

public?void?run()?{

while(true){

try?{

Thread.sleep(1000);

}?catch?(InterruptedException?e)?{

e.printStackTrace();

}

if(i<7)

i++;

else

i=0;

repaint();

}

}

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

F?f=new?F();

Thread?t=new?Thread(f);

t.start();

}

}

運行結果

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