【无标题】java作业(11月3号)

class AAA{
     private  int  money;
     private  int getMoney(){
           return money;
     }
     public static viod main (String args[]){
         AAA exa=new AAA();
         exa.money=3000;
         int m=exa.getMoney();
         System.out.peintln("money="+m);
      }
  }  
                     如果将上述源文件修改如下（修改为有两个类）：
 class AAA{
        private  int  money;
        private  int getMoney(){
           return money;
    }
}
  class E{
      public static viod main (String args[]){
         AAA exa=new AAA();                           //对象exa在E类中，不在AAA类中
         exa.money=3000;                             //非法
         int m=exa.getMoney();                       //非法
         System.out.peintln("money="+m);
      }
  }  
   那么
exa.money=3000;
int m =exa.getMoney();

4.17

public class Example4_17{
        public  static viod main(String args[]){
           Student zhang=new Studenet();
           Student geng=new Student();
           zhang.setAge(23);
           System.outprinrln("zhang的年龄："zhang.getAge());
           geng.setAge(25);
           //"zhang.age=23;"或"geng.age=25;"都是非法的，因为zhang和peng已经不在Student类中
           System.out.println("geng的年龄:"+geng.getAge());
       }

     }

4.10

4.9

4.8

4.6

4.4

4.3

4.2

public class Example4_ 2 {                               //应用程序的主类
       public static void main(String args[]) {
       XiyoujiRenwu zhubajie = null,sunwukong =null;     //声明对象
       zhubajie = new Xiyouj iRenwa();                   //为对象分配内存，使用ner运算符和默认的构造方法
       sunwukong = new XiyoujiRenwu();
       zhubajie. name = PersonName.八戒;                  //对象zhubajie给自己的变量赋值
       zhubajie. height= 1.83f;
       zhubajie. weight= 86f;
       zhubajie. head="猪头";
       sunwukong. name = PersonName.悟空;                //对象sunwukong给自己的变量赋值     
       sunwukong. height= 1. 66f;
       sunwukong. weight = 1000f;
       sunwukong. head= "猴头";
       System. out. println( zhubajie. name+ "的身高:"+ zhubajie. height);
       System. out. println( zhubajie. name+"的体重:"+ zhubajie. weight);
       System. out. println( zhubajie. name+ "的头:"+ zhubajie. head);
       System. out. println( sunwukong. name+ "的身高:" + sunwukong. height);
       System. out. println( sunwukong. name + "的体重:" + sunwukong. weight);
       System. out. println( sunwukong. name + "的头:" + sunwukong. head);
       zhubajie. speak( zhubajie. name + "我想娶媳妇"); E //对象 调用方法
       System. out. println( zhubajie. name+ "现在的头:" + zhubajie. head);
       sunwukong. speak( sunwukong. name + "我重" +

                  sunwukong. weight +"公斤,想骗八戒背我");            //对象调用方法

         System. out. println( sunwukong. name + "现在的头:"+ sunwukong. head);

     }
  }

4.1