The use of increment and decrement operators in java

1. The use of the increment and decrement operators is different in the two scenarios

(1) When used alone, the result of the operation is the same no matter where the "++" symbol is;

The following two examples are used for comparison

eg1 :

public static void main(String[] args){
 int i =10;
 System.out.println("i:"+i);
//输出结果为： i:10
 i++;
  System.out.println("i:"+i);
//输出结果为： i:11
}

eg2：

public static void main(String[] args) {
 int i =10;
    System.out.println("i:"+i);
//输出结果为 i:10
++i;
  System.out.println("i:"+i);
//输出结果为 i:11

(2) When participating in the operation, if it is placed behind the variable, first use the variable to participate in the operation, and then use the variable as ++ or --;

When participating in the operation, if it is placed in front of the variable, first use the variable as ++ or --, and then use the variable to participate in the operation;

Here are two examples for a deeper understanding:

eg1:

	public static void main(String[] args) {
	int i=10;
  int j=i++;
  System.out.println(i);
//输出结果为 11
  System.out.println(j);
//输出结果为10
｝

eg2:

	public static void main(String[] args) {
	int i=10;
  int j=++i;
  System.out.println(i);
//结果为11
  System.out.println(j);
//结果为11
}

2. To summarize

Apply the rules

symbol	effect	illustrate
++	auto increment	The value of the variable is incremented by 1
--	Decrement	Decrement the value of the variable by 1