java巅峰作业

//3
interface Animal{
	abstract void run();
}

class Bird implements Animal{
	public void run() {
		System.out.println("Bird测试成功");
	}
}

class Fish implements Animal{
	public void run() {
		System.out.println("Fish测试成功");
	}
}

public class Animaljiekou{
	public static void main(String[]args) {
		Animal p1 = new Bird();
		p1.run();
		
		p1 = new Fish();
		p1.run();
	}
}

//1

import java.util.*;
public class Manager {
	private int pre;
	private int cur;
	public Manager()
	{
		this.pre = 0;
		this.cur = 0;
		System.out.println("上月="+pre+"   本月="+cur);
		
	}
	public Manager(int pre,int cur)
	{
		this.pre = pre;
		this.cur = cur;
		System.out.println("上月="+pre+"   本月="+cur);
	}
	public int Summation() {
		int sum;
		sum =  pre + cur;
		System.out.println("总共"+sum);
		return sum;
	}

}



public class TestManager {

	public static void main(String[] args) {
		Manager m1 = new Manager();
		Manager m2 = new Manager(15,5);
		m1.Summation();
		m2.Summation();


	}

}


//2
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class UserLogin extends JFrame {
	JFrame jf;
	JPanel jpanel;
	JLabel jl1;
	JLabel jl2;
	JLabel jl3;
	JTextField jt;
	JPasswordField jp;
	JButton jb1;
	JButton jb2;	
	public void JDialog() {
		jf =new JFrame();
		jl3 = new JLabel("暂无数据");
		jf.setSize(300, 150);
		jf.add(jp);
		jp.add(jl3);
	}			
	public void CreateJFrame(String title) {
		jf = new JFrame(title);
		jpanel = new JPanel();
		jl1 = new JLabel("用户名");  //标签1
		jl2 = new JLabel("密   码");   //标签2
		jt = new JTextField(18);   //文本框1
		jp = new JPasswordField(18);  //文本框2
		jb1 = new JButton("登录");   //按钮1
		jb2 = new JButton("重置");   //按钮2
		
		jf.add(jpanel);
		jpanel.add(jl1);    //添加到容器
		jpanel.add(jt);
		jpanel.add(jl2);
		jpanel.add(jp);
		jpanel.add(jb1);
		jb1.addActionListener(new ActionListener() {//给登录按钮添加事件处理
			public void actionPerformed(ActionEvent e) {
				JOptionPane.showMessageDialog(null,"暂无数据");
			}
		});
		
		jpanel.add(jb2);
		jb2.addActionListener(new ActionListener() {//给重置按钮添加事件处理
			public void actionPerformed(ActionEvent e) {
				jt.setText("");
				jp.setText("");
			}
		});
		
		jf.setVisible(true);//设置窗口可见
		jf.setSize(300,150);//设置窗口大小		
	}
	public static void main(String[] args) {
		new UserLogin().CreateJFrame("用户登录");
	}
}

计算器面板

import java.awt.*;
import javax.swing.*;
import javax.swing.border.Border;

public class Calculator extends JFrame {
					
	public void CreateJFrame(String title) {
		JFrame jf;
	    JPanel jp1 = new JPanel(new GridLayout(5,3,0,0));//新建一个5*3网格布局的面板
	    JPanel jp2 = new JPanel(new GridLayout(4,1,0,0));//新建一个4*1网格布局的面板
	    JTextField jt;                                   //声明文本框
	    String[] button1 = {"1","2","3","4","5","6","7","8","9","0","清空","退格",".","="};
	    String[] button2 = {"+","-","*","/"};
	 
		jf = new JFrame("计算器");//新建窗口
		
		
		Container c = getContentPane();                //定义一个容器
		setLayout(new BorderLayout());                 //设定为边界布局
		jf.add(c);
		c.add(BorderLayout.NORTH,jt = new JTextField(18));//添加文本框
		c.add(BorderLayout.CENTER,jp1);                   //在容器的中间加上面板1
		c.add(BorderLayout.EAST,jp2);                     //在容器的右边加上面板2


		for(int i = 0;i<button1.length;i++) {              //给面板1循环添加按钮
			jp1.add(new JButton(button1[i]));
		}
		
		for(int i = 0;i<button2.length;i++) {             //给面板2循环添加按钮
			jp2.add(new JButton(button2[i]));
		}

		jf.setVisible(true);//设置窗口可见
		jf.setSize(300,300);//设置窗口大小		
	}
	public static void main(String[] args) {
		new Calculator().CreateJFrame("计算器");
	}
}