（测试类）

package com.badu;

public class Tste {

    public static void main(String[] args) {

        Class5 sa=new Class5("周阿郎",3,2,24);

        Class5 [] a=new Class5[5];

        a[0]=new Class5("张扬",2,4,34);

         a [1]=new Class5("刘禅",3,2,24);

        a[2]=new Class5("张燕",4,23,78);

        a [3]=new Class5("周少博",32,23,99);

        a [4]=new Class5("张旭",24,13,100);

        System.out.println(sa.toString());

        double [] w={a[0].getSJava(),a[1].getSJava(),a[2].getSJava(),a[3].getSJava(),a[4].getSJava()};

        int s=0;

            double max=w[2];

            double min=w[0]; 

        for(int i=0;i<5;i++){

            s+=w[i]/5;

            if(max<w[0]){

                max=w[2];

            }

            if(min>w[0]){

                min=w[0]; 

            } 

        }

        System.out.println("java成绩的平均值为"+s+",最小值为"+min+",最大值为"+max);

    }

}

（一）

package com.badu;

public class Class5 {

  private String name;

  private int age;

  private int sno;

  private int sJava;

  public  Class5(String a,int w,int g,int l){ 

      name=a;

      age=w;

      sno=g;

      sJava=l; 

  }public  Class5(int b){

      age=b;

  }public Class5(int c,int d){ 

      sno=c;

      sJava=d; 

  }

  public Class5(){}

    public String getName(){

        return name; 

    }

    public int getAge(){

        return age;

    }

    public int getNo(){

        return sno;

    }

    public int getSJava(){

        return sJava;

    }

    public String toString (){

        String s="我叫"+name+",我今年"+age+"岁"+"我的java成绩是"+sJava;

        return s;

    }

    public static void main(String[] args) { 

    }

}