代码如下:public class HelloWorld { public static void main(String []args) { int a = 3, b = 7 ;System.out.println("Hello World!");} public static int f(int a, int b){ return a*a + a*b + b*b;} } 结果如下:...
import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.math.BigDecimal;import javax.swing.*;public class TestComputer implements ActionListener{//用于接收操作事件的侦听器接口。对处理操作事件感兴趣的类可以实现此接口,//而使用该类创建的对象可使...
import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;SuppressWarnings("serial")public class Test02 extends JFrame { private JPanel jp = new JPanel();private JBu...
import java.util.Scanner;import java.util.regex.Pattern;public class EasyTest { public static void main(String[] args) { int num=0;Scanner scan;System.out.println("请输入一个字符串");scan=new Scanner(System.in);String s1=scan.nextLine();System.out.println("请输入一个字符");S...
/*计算器*/import java.awt.*;import javax.swing.*;import javax.swing.border.*;import java.awt.event.*;public class Calculator implements ActionListener{ JFrame frame; JPanel panel; JTextField tfShow;/*定义显示文本框*/ JButton b1[]=new JButton[10]; /*数字按钮*/ ...