Java - Compound Boolean Logical Assignment Operators

What are Compound Boolean Logical Assignment Operators?

There are three compound Boolean logical assignment operators.

The operand1 must be a boolean variable and op may be &, |, or ^.

Java does not have any operators like &&= and ||=.

Compound Boolean Logical Assignment Operators are used in the form

operand1 op= operand2

The above form is equivalent to writing

operand1 = operand1 op operand2

The following table lists the compound logical assignment operators and their equivalents.

Expression is equivalent to
operand1 &= operand2 operand1 = operand1 & operand2
operand1 |= operand2 operand1 = operand1 | operand2
operand1 ^= operand2 operand1 = operand1 ^ operand2

For &= operator, if both operands evaluate to true, &= returns true. Otherwise, it returns false.

boolean b = true;
b &= true;  // Assigns true to b
b &= false; // Assigns false to b

Demo

public class Main {
  public static void main(String[] args) {
    boolean b = true;
    b &= true;  // Assigns true to b
    System.out.println ("b = " + b);
    b &= false; // Assigns false to b
    System.out.println ("b = " + b);

  }//from   w  w w  .  ja  v  a  2  s. co m
}

Result

For != operator, if either operand evaluates to true, != returns true. Otherwise, it returns false.

boolean b = false;
b |= true;  // Assigns true to b
b |= false; // Assigns false to b

Demo

public class Main {
  public static void main(String[] args) {
    boolean b = false;
    b |= true;  // Assigns true to b
    System.out.println("b = " + b);
    b |= false; // Assigns false to b
    System.out.println("b = " + b);
  }/*from   ww  w.  j a v  a  2 s  . c  o  m*/
}

Result

For ^= operator, if both operands evaluate to different values, that is, one of the operands is true but not both, ^= returns true. Otherwise, it returns false.

boolean b = true;
b ^= true;  // Assigns false to b
b ^= false; // Assigns true to b

Demo

public class Main {
  public static void main(String[] args) {
    boolean b = true; 
    b ^= true;  // Assigns false to b
    System.out.println("b = " + b);
    b ^= false; // Assigns true to b
    System.out.println("b = " + b);
  }//from   ww w. ja  v  a2s  .  c o  m
}

Result