The role of this in java

This keyword is used in Java to refer to the current instance of an object. Its specific functions include: referencing the current object instance calling other constructors from the constructor accessing members of the external class from the inner class

The role of this in Java

Short answer:
This keyword is used in Java to the current instance of the referenced object.

Detailed answer:

This keyword is a reserved word in Java, which can be used in methods, constructors and inner classes. Its main function is:

• Reference the current object instance: this points to the object instance of the currently executing method or constructor. It can be used to access the variables and methods of that instance.
• Call other constructors from a constructor: This can be used to call one constructor from another constructor. It must appear as the first statement of the constructor.
• Accessing members of the outer class from the inner class: Inner classes can use this to access members of the outer class. It must be used with the outer class name in the format: this.OuterClass name.Member name.

Example:

public class Example {
    private int x;

    public Example(int x) {
        this.x = x;
    }

    public int getX() {
        return this.x;
    }

    public static void main(String[] args) {
        Example example = new Example(10);
        int x = example.getX();
        System.out.println(x); // 输出 10
    }
}

In the above example:

• ConstructorExample(int x)#this.x = x in ## assigns the parameter value to the object variable x.
• this.x in method getX() accesses object variable x.

By using this, you can clearly represent the current instance of an object and avoid using duplicate or ambiguous variable names in your code.

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