What does this in java mean?

this represents the class instance itself.

Usage of this

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 member variables of the class, not function parameters. Pay attention to distinguishing between function parameters and member variables when they have 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){
   }
}

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