displaying 2 dim array

[purna adinarayan]

when i am trying to display the contents of this array its showing arrayindexoutofbounds exception...how do i display this array?




<%

String names[][] = new String[10][2];



for(int i=0;i>=10;i++){

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


names[i][j]="anu";

if(j>0){

names[i][j]="radha";

}
}
}


for(int z=0;z<10;z++){


for(int y=0;y<z;y++){

System.out.println(names[z][y]);

}

}

%>

[Henry Wong]

The first set of loops doesn't actually do anything -- as the outer loop doesn't run any iterations. This means that you never set any strings, and hence, there is nothing to display.

The second set of loops ... well, the shape of the arrays is like a "10 by 2 rectangle" and you traverse it like a "10 by 10 right triangle". This is, of course, where your array out of bounds is happening.

Henry

[purna adinarayan]

Henry Wong wrote:The first set of loops doesn't actually do anything -- as the outer loop doesn't run any iterations. This means that you never set any strings, and hence, there is nothing to display.

The second set of loops ... well, the shape of the arrays is like a "10 by 2 rectangle" and you traverse it like a "10 by 10 right triangle". This is, of course, where your array out of bounds is happening.

Henry

i changed the code..i am now getting only null values....please help me with this.....

<%

     String names[][] = new String[10][2];

     int num=0;

     for(int i=0;i>=10;i++){

           names[i][num]="anu";

           names[num][i]="radha";
            num++;

      
     }

   
 for(int z=0;z<10;z++){


      for(int y=0;y<2;y++){

         out.println(names[z][y]);

      }

   }


  

%>

i want the output to be displayed like this as below:


anu radha
anu radha
anu radha
.
.
.
.
.
10 times

[Henry Wong]

The first loop still doesn't do anything -- so nothing is actually set.

Henry

[Ashwin Rao]

purna adinarayan wrote:

     String names[][] = new String[10][2];

     int num=0;

     for(int i=0;i>=10;i++){

           names[i][num]="anu";

           names[num][i]="radha";
            num++;

      
     }

Just work through this code fragment on paper and see if it's actually doing what you want it to do!
Hint: Pay attention to the loop condition in the for loop.

[Campbell Ritchie]

The correct way to display that array is of course
System.out.println(Arrays.deepToString(myArray));

Start by stopping saying 2D array. You have an array of arrays, which is different from the old concept of a 2D array. Whenever you iterate that array, you get its elements which are arrays. So you have to iterate those arrays too.

Of course you can always assign a complete array
names[0] = new String[]{"Anu", "Radha"};