For loops problem

[Terence hiu]

This might be a simple question to you guys, but im having difficulties with this.
Why won't this for loop print out 1 to 31 as on dayInMonth array? but instead it only goes up to 12?

	private int[] dayInMonth ={31,28,31,30,31,30,31,31,30,31,30,31};

	public String setUpCal(){
			for(int x=0;x<dayInMonth[x]; x++){
				System.out.print(x+1+"\t");
			}
			return null;
	}
	
	public static void main(String[]args){
		PrintfTest f = new PrintfTest();
		System.out.println(f.setUpCal());
	}
}

[Kemal Sokolovic]

Your for loop is totally different from what you want. This code should produce ArrayIndexOutOfBoundsException after printing value 12.

What you want to do in for loop is initialize counter (say your x) to go from 0 to the last index value of an array (note that you can get length of an array with array.length). Then inside your loop you would access and print out value that is stored in the array at position (index) specified by x, not x + 1.

Also, please read UseCodeTags (<-click) and edit your post accordingly so the code will be easier to read.
And, welcome to the Ranch!

[Terence hiu]

Thank you for your help, I finally solved the problem.
Thank you very much!

[Campbell Ritchie]

I have added code tags, and you can see how much better it looks. Why are you returning null? That is a potentially dangerous practice. That method ought to have void for its return type.