Looping Arrays Tutorial
From Progzoo
You can use a for loop to access each element of an array. There are two different styles of for loop. One uses an index the other does not:
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"for-each"
This kind of for loop does not use an index. It is simpler and more readable. Use this style of loop wherever possible.
int [] list = {1,2,3};
for (int v:list)
System.out.println( v );
Indexed loop
You use this kind of for when you need to get to the index. The later questions in this section use this style.
for (int i=0;i<list.length;i++) System.out.println( list[i] );
Print Double Every Item
Print twice the value for each item of the array.
For the array [2, 7, 5, 3] you should print:
4 14 10 6
Print Every Item Twice
Print the value twice for each item of the array.
For the array [2, 7, 5, 3] you should print:
2 2 7 7 5 5 3 3
Print Every Item Two Times
Print the value two times on the same line for each item of the array.
For the array [2, 7, 5, 3] you should print:
22 77 55 33
Print Every Item Times the Index
For each item print the value times the index.
For the array [2, 7, 5, 3] you should print:
0 0*2 7 1*7 10 2*5 15 3*3
Print the Index and the Item
For each item print the index and the value.
For the array [2, 7, 5, 3] you should print:
0 2 1 7 2 5 3 3
Print the Index and List Backwards
Print the index and list backwards.
For the array [2, 7, 5, 3] you should print:
0 3 1 5 2 7 3 2
The expression x[x.length-i-1] will get you the index "backwards". So if i goes 0 1 2 3 then x.length-i-1 will go 3 2 1 0
Print the List and the number of Succeeding Items
Print each item followed by the number of remaining items.
For the array [2, 7, 5, 3] you should print:
2 3 7 2 5 1 3 0