Boolean_KeyWord

旧城等待， 2021-11-05 06:36 236阅读 0赞

## boolean Java Keyword with Examples ##

In this short article, we will discuss everything about the boolean keyword in Java.

Defines a boolean variable for the values “true” or “false” only. By default, the value of boolean primitive type is false. This keyword is also used to declare that a method returns a value of the primitive type boolean.  
boolean is a Java primitive type.  
A boolean variable may take on one of the values true or false.  
The Boolean class is a wrapper class for the boolean primitive type.

### boolean Java Keyword Examples ###

Note that in below example, we are using boolean variables - isEmpty and initialized.

package com.javaguides.corejava.keywords;
    
    import java.util.ArrayList;
    import java.util.List;
    
    public class BooleanKeywordExample {
        public static void main(final String[] args) {
    
            boolean isEmpty = false;
            final List < Integer > integers = new ArrayList < > ();
            if (integers.size() == 0) {
                isEmpty = true;
            }
    
            System.out.println("Is List Empty :: " + isEmpty);
        }
    
        private boolean initialized = false;
    
        public void synchronizeConnection() {
            if (!initialized) {
                // some code here
                initialized = true;
            }
        }
    }

### Summary ###

*  A boolean variable may only take on the values true or false. A boolean may not be converted to or from any numeric type.
 *  Expressions containing boolean operands can contain only boolean operands.
 *  The Boolean class is a wrapper class for the boolean primitive type.

Boolean_KeyWord

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