例5.1
AvgScores.java

import java.text.DecimalFormat;  
class AvgScores  
{
    public static void main(String args[]){         
        String names[]={"张国荣","丁二","陈坤"};
        DecimalFormat df=new DecimalFormat("#");
        int[][] iScores={{89,98,87},{90,88,95},{86,92,93}};
        int i,j;
        double avg;
        for(i=0;i<iScores.length;i++)
        {
            avg=0.0;
            for(j=0;j<iScores[i].length;j++)
                avg+=iScores[i][j];

            avg=avg/j;
            System.out.println(names[i]+":"+df.format(avg));
        }
    }

}

例5.3
ReturnArray.java

public class ReturnArray{  
    static int[ ] updateArray(int[] arrays){
        for(int i=0;i<arrays.length;i++){
            arrays[i]=i;
        }
        return arrays;
    }
    public static void main(String []args){    
        int[] hold={9,8,7,3,5,6,4,2,1,0};
        hold= updateArray(hold);
        for(int i=0;i<hold.length;i++)
            System.out.println("hold["+i+"]="+hold[i]);
    }
}

例5.4
MyFriend.java

public class MyFriend{  
     public static void main (String arg[]){
    if(arg.length>=2)
               System.out.println(arg[0]+ " and "+ arg[1] +" are my good friends! ");
    }
}

注：本博客内容节选自高飞编著的Java程序设计实用教程 ，详细内容请参阅书籍。