What does this in java mean?

#This in java represents the class instance itself.

Usage of this: (Recommended: java video tutorial)

1. Indicates a reference to the current object!

public class A{
public A getA(){
return this;//表示获取当前实例本身
}
}

2. Represents the member variables of the class, not the function parameters. Pay attention to the distinction between the function parameters and the member variables with the same name!

public class A{
private　int a = 0;//位置1
public A getA(int a){
this.a = a;//前面this.a表示 位置1 的a，赋值=号右侧的表示参数a
}
}

3. Used to reference the constructor that meets the specified parameter type in the constructor.

public class A{
public A(int a){
}
public A(){ 
this(1);//这里调用自身的构造函数public A(int a){
}
}

Detailed explanation of this in java:

In java, the this keyword has many uses. In java, this is a reference variable that refers to the current object.

java The usage of this keyword is as follows:

1. This keyword can be used to reference instance variables of the current class.

2. The this keyword can be used to call the current class method (implicitly).

3. this() can be used to call the constructor of the current class.

4. The this keyword can be passed as a parameter in the calling method.

5. The this keyword can be passed as a parameter in the constructor call.

6. The this keyword can be used to return an instance of the current class from a method.

Suggestion: If you are a Java beginner, just learn the first three uses of this keyword.

For more java knowledge, please pay attention to the java basic tutorial column.

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