Java basics-06 if statement and if...else statement

if statement

The program executes a certain statement when a certain condition is established, and executes another statement in another case.

Examples are as follows

int x=34;
int y=20;
//判断x是否大于y
if(x>y){
    //如果条件成立，则输出以下信息
    System.out.println("x>y");
}
//判断x是否小于y
if(x<y){
    //如果条件成立，则输出以下信息
    System.out.println("x<y");
}

if...else statement

The program executes a certain statement when a certain condition is established, otherwise executes another statement.

Examples are as follows:

int x=34;
int y=20;
//判断x是否大于y
if(x>y){
    //如果条件成立，则输出以下信息
    System.out.println("x>y");
}
//除了x>y的情况，其他情况都输出以下信息
else{
    System.out.println("x<=y");
}

The difference between if statement and if...else statement

Although both statements are used to express judgment, the if statement will only cover one case of judgment at a time, and if...else will include all cases of judgment.

Take the picture as an example