Deep understanding of the differences between i++ and ++i in Java _java

Today, a simple talk about Java, I believe that a lot of friends just started learning Java will encounter this problem, although the problem is very simple, but often easy to confuse, say Java i++ and ++i difference.

First look at the code:

<span style= "FONT-SIZE:18PX;" >public class Test {public
	static void Main (string[] args) {
		int i = 0;
		for (int j = 0; J < J + +) {
			i=i++;
		}
		SYSTEM.OUT.PRINTLN (final result of "I" +i);
	}
</span>

We can see the result at a glance, how much is the result? Is it 10?

Believe that there are many friends at first glance, think the answer is 10, the correct answer is: 0;

Just beginning to learn the C,java, the teacher has spoken of the form of self: namely: i++ and ++i;

In fact, the difference is that i=i++ is the first assignment in the self increase, so no matter how many times, the left of I is always 0, the final result is 0. To I=++i, can achieve the effect, ++i is the first increment in the assignment.

You can understand this by looking at the code:

<span style= "FONT-SIZE:18PX;" >public class Test {public
	static void Main (string[] args) {
		int i = 0;
		for (int j = 0; J < J + +) {
			i=i++;
		}
		SYSTEM.OUT.PRINTLN (final result of "I" +i);
	}
	
	
	The public static int count (int i) {
		//TODO auto-generated Method Stub//
		is selected to save the initial value, JVA open the temporary variable area
		int temp=i;
		Do self increase
		i = i++;
		Returns the original value return
		temp
		

	;
}
</span>

So to achieve the increase can be used i=++i, but generally direct use of i++, so better; This is also a Java's self-increasing trap.

The above in-depth understanding of the Java i++ and ++i is the difference between the small series to share all the content, hope to give you a reference, but also hope that we support the cloud habitat community.