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- 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
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.
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