Pg168-1

package org.hanqi.pn0120;

public class Computer {
    
    private double neicundx=10;

    public double getNeicundx() 
    {
        return neicundx;
    }

    public void setNeicundx(double neicundx)
    {
        this.neicundx = neicundx;
    }

    public Computer()
    {
        
    }
    
    public static void main(String[] args)
    {
        Computer myComputer=new Computer();
        
         myComputer.setNeicundx(4);
        
        System.out.println("内存大小="  +myComputer.getNeicundx());
    }
}

package org.hanqi.pn0120;

public class Text3 {

    public static void main(String[] args) {
        
        Computer myComputer1=new Computer();    
        
        System.out.println("myComputer1内存大小=" +myComputer1.getNeicundx());

    }
}

package org.hanqi.pn0120;

public class Emperor {
    private static Emperor emperor=null;
    
    private Emperor()
    {    
        
    }
    public static Emperor getInstance()
    {
        if(emperor==null)
        {
            emperor=new Emperor();
        }
        return emperor;
    }
    public void getName()
    {
        System.out.println("我是皇帝：明日科技");
    }
}

package org.hanqi.pn0120;

public class Test {

    public static void main(String[] args) {
    
        System.out.println("创建皇帝1对象：");
        
        Emperor emperor1=Emperor.getInstance();
        
        emperor1.getName();
        
        System.out.println("创建皇帝2对象：");
        
        Emperor emperor2=Emperor.getInstance();
        
        emperor2.getName();
        
        System.out.println("创建皇帝3对象：");
        
        Emperor emperor3=Emperor.getInstance();
        
        emperor3.getName();
        
        
    }

}