1月18日 - 上午讲课内容代码 矩形

package com.hanqi;

//import java.util.*;

public class JuXing 
{
    
    //属性
    
    private double chang; //长
    
    private double kuan;  //宽
    
    public double getChang() //读
    {
        return chang;
    }
    
    //写
    public void setChang(double chang)
    {
        //加验证
        if(chang > 0)
        {
        this.chang = chang;
        }
        else
        {
            System.out.println("长度值无效");
        }
    }

    
    
    public double getKuan() 
    {
        return kuan;
    }

    public void setKuan(double kuan) 
    {
        if(kuan > 0)
        {
        this.kuan = kuan;
        }
        else
        {
            System.out.println("宽度值无效");
        }
        
    }
    
    //无参的默认构造方法
    public JuXing()
    {
        
    }
    
    //给属性赋初始值
    public JuXing(double chang,double kuan)
    {
        setChang(chang);
        
        setKuan(kuan);
        
    }
    
    
    //方法
    
    //面向过程的写法（错误示范）
    public double getMianJi(double chang,double kuan)
    {
        return chang * kuan; 
    }
    
    
    //面向对象的写法（正确示范）
    public double getMianJi()
    {
       return this.chang * this.kuan;
    }
    

}

package com.hanqi;

public class cx 
{
    
    private double chang;
    
    private double kuan;

    public double getChang() 
    {
        return chang;
    }

    public void setChang(double chang) 
    {
        if(chang > 0)
        {
        this.chang = chang;
        }
        else
        {
        System.out.println("骚年，你逗我？？");
        }
    }

    public double getKuan() 
    {
        return kuan;
    }

    public void setKuan(double kuan) 
    {
        if(kuan <= 0)
        {
            System.out.println("数学是体育老师教的？？");
        }
        else
        {
        this.kuan = kuan;
        }
    }
    
    cx()
    {
        
    }
    
    cx(double chang,double kuan)
    {
        setChang(chang);
        
        setKuan(kuan);
    }
    
    public double Mianji()
    {
        return this.chang * kuan;
    }
    
    
    

}

package com.hanqi;

public class TestPC {

    public static void main(String[] args) {
        // TODO 自动生成的方法存根

        JuXing jx = new JuXing();
        
        jx.setChang(10);
        
        jx.setKuan(5);
                        
        System.out.println("面积 = "+jx.getMianJi());
        
        
        cx cfx = new cx();
        
        cfx.setChang(1);
        
        cfx.setKuan(2);
        
        System.out.println("面积 = "+ cfx.Mianji());
        
        
        for(int i = 0;i < 10; i++)
        {
        
        TestStatic ts = new TestStatic();
        
        
        ts.add();
        }
        
        TestStatic.add2(1, 2);
        
        
    }

}