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:

<code class="java">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
    }
}</code>

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.

The above is the detailed content of The role of this in java. For more information, please follow other related articles on the PHP Chinese website!