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Java Booleans

In some cases we need a variable to store only two possible values, either false or true. For this, boolean data type is used in java. The variable declared as boolean can take either true or false as value.

Boolean Variable in java
Boolean variable is declared using boolean keyword and can take true or false value.


public class JavaBooleanExample {
public static void main(String[] args) {
int age1=30;
int age2=40;
boolean elder=true;
boolean younger=false;
if(age1<age2)
{
System.out.println(elder);
}
else
{
System.out.println(younger);
}
}
}

Java Boolean Expressions

An expression involves multiple variables and some arithmetic and logical operators and function calls. Final result of a boolean expression will be true or false

Following is an example of a boolean expression:


int a = 20;
int b = 30;
int c = 300;
if( (a+b)<c)
{
System.print.ln("Sum of a and b is less than value in c");
}