Answer Posted / ranganathkini

The 'this' keyword in Java has the following uses:

1. To resolve ambiguity where a local variable hides a class
member. Example:

class MyClass {
private int value;

public MyClass( int value ) {
// local variable 'value' hides class field 'value'
this.value = value;
}
}

2. To invoke one constructor overload from another. Example:

class MyClass {
private int value;

public MyClass( int value ) {
this.value = value;
}

public MyClass() {
// invoke MyClass( int value )
this( 0 );
}
}

3. To pass the current object instance as a parameter to a
method. Example:

class MyClass {
private int value;

public MyClass( int value ) {
this.value = value;
// pass current instance as a parameter to the method
displayValue( this );
}

public static void displayValue( MyClass mc ) {
System.out.println( "Value = " + mc.value );
}
}

4. To invoke an outer class's non-static method from a
non-static inner class. Example:

class MyOuterClass {

class MyInnerClass {
public MyInnerClass() {
// call the outer class's method
MyOuterClass.this.displayText( "Inner instance
created" );
}
}

public void displayText( String text ) {
System.out.println( text );
}
}

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