绘制长方形代码java 用java代码画出长方形

JAVA 如何在屏幕上画一个红色的长方形

代码如下：

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

public class App extends JFrame {

public App() {

this.setSize(400, 400);

this.setLocationRelativeTo(null);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

@Override

public void paint(Graphics g) {

super.paint(g);

g.setColor(Color.RED);

g.drawRect(20, 100, 300, 150);

}

public static void main(String[] args) {

new App().setVisible(true);

}

}

运行结果：

java长方形

Scanner scanner = new Scanner(System.in);

System.out.println("请输入长方形的长:");

int inputWidth = scanner.nextInt();

System.out.println("请输入长方形的宽:");

int inputHeight = scanner.nextInt();

int area = inputWidth * inputHeight;

int perimeter = 2*(inputWidth+inputHeight);

System.out.println("宽为"+inputWidth+"高为"+inputHeight+"的长方形：");

System.out.println("面积为："+area);

System.out.println("周长为："+perimeter);

scanner.close();

java中做一个按钮，点击按钮后画一个矩形的代码怎么写？

兄弟帮你写了一个：

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("画圆");

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);

}

}

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