Arrays in Java

Arrays

Group of similar elements is called array. Array occupies continuous memory. Arrays are index based. Also unused memory filled with default values depending on the name of the datatype.

Int [ ] marks = new int [3];
Marks [0] = 80;
Marks [1] = 90;
Marks [2] = 100;
Int (i = 0, i<marks.length, i++){
System.out.println ( marks[i] );
}
Or
Int i = 0;
While (i<marks.length){
System.out.println ( marks[i] );
i++;
}

2-D Array
Int [ ] m1 = { 34, 47, 87 } ;
Int [ ] m2 = { 26, 76, 90 } ;
Int [ ] m3 = { 45, 64, 59 } ;
Int [ ] [ ] a = { m1, m2, m3 };

System.out.println ( a [0] [0] ); System.out.println ( a [1] [0] );
System.out.println ( a [0] [1] ); System.out.println ( a [1] [0] );
System.out.println ( a [0] [2] ); System.out.println ( a [1] [0] );
Int i = 0;
For ( j =0, j<3, j++ );
System.out.println ( a [i] [j] );
i++;
For ( j =0, j<3, j++ );
System.out.println ( a [i] [j] );
i++;
For ( j =0, j<3, j++ );
System.out.println ( a [i] [j] );
Or
For (i = 0, i<3, i++); {
For (j=0, j<3, j++);
{ System.out.println ( a [i] [j] ) + “ “ ); }
System.out.println ();
}

Output : 34 47 87
26 76 90
45 64 59