该代码在哪里错误 [英] where is this code is wrong

问题描述

package javaapplication3;
public class thread
{
public static void main(String[] args)
    {
    int a[][]={{3,4,2,9},{2,3,4,5},{2,2,3,4}};
    int b[][]={{6,7,8,3},{4,2,1,3},{8,3,5,6}};
    int sum[][]=new int[4][4];
    System.out.println("First Matrix A is:-");
    for (int i=0;i<=3;i++)
    {
        for (int j=0;j<=3;j++)
        {
            System.out.print(" "+a[i]);
        }
        System.out.println();
    }
    System.out.println("First Matrix B is:-");
    for (int i=0;i<=3;i++)
    {
        for (int j=0;j<=3;j++)
        {
            System.out.print(" "+b[j]);
        }
        System.out.println();
    }
    }

}

推荐答案

在这里是错误的(例如)

It is wrong (for instance) here

报价:

System.out.print(" + a [i]);

System.out.print(" "+a[i]);

更改为:

System.out.print(" "+a[i][j]);

还有这里

and here

报价:

System.out.print(" + b [j]);

System.out.print(" "+b[j]);

更改为:

System.out.print(" "+b[i][j]);

尝试一下.并看到加粗标记的文本.

Try this. and see the bold marked text.

        int a[][] =
    {
        { 3, 4, 2, 9 },
        { 2, 3, 4, 5 },
        { 2, 2, 3, 4 }

    };
int b[][] =
    {
        { 6, 7, 8, 3 },
        { 4, 2, 1, 3 },
        { 8, 3, 5, 6 }
    };
// int sum[][]=new int[4][4];
System.out.println("First Matrix A is:-");
for (int i = 0; i < a.length; i++) {//upto rowlength
            for (int j = 0; j < a[i].length; j++) { //upto column length
       System.out.print(" " + a[i][j]);//get particular index data
    }
    System.out.println();
}
System.out.println("First Matrix B is:-");
for (int i = 0; i < b.length; i++) {
    for (int j = 0; j < b[i].length; j++) {
        System.out.print(" " + b[i][j]);
    }
    System.out.println();
}

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