pre and post increment
i++ shows that the value of i is post incremented after operation, ++i shows that its pre incremented before operation.
Example
public class Test {
public static void main(String args[]) {
int i = 5;
//--------------------------------
//--------POST INCREMENT----------
System.out.println("5 because of post increment : " + i++);
System.out.println("6 because value incremented above : " + i);
// execution from left to right, this will output 6 7 8
System.out.println(i++ + " " + i++ + " " + i++);
// output 9
System.out.println("output 9 : " + i);
//--------------------------------
//--------PRE INCREMENT----------
System.out.println("10 because of pre increment : " + ++i);
System.out.println("10 because same : " + i);
// execution from left to right, this will output 10 11 12
System.out.println(++i + " " + ++i + " " + ++i);
// output 9
System.out.println("output 13 : " + i);
}
}
