Conditional

Java uses boolean variable to check the condition. The value can be only true or false compared or checked with the condition.

if statement in Java

For example:

int a = 1;
int b = 1;

if (a==b) {
    System.out.println("It's true!");
}
if (a==1) { 
    System.out.println("It's true!");
}
if (b==1) { 
    System.out.println("It's true!");

}

if else statement in Java

For example:

int a = 2;

if (a==1) {
    System.out.println("It's true!");
} else { 
    System.out.println("It's false!");
}

else if statement in Java

For example:

int a = 2;

if (a==1) {
    System.out.println("a is 1!");
} else if (a==2) { 
    System.out.println("a is 2!");
}

boolean operators in Java

int a = 3;
int b = 4;
boolean result;
result = a < b; // true
result = a > b; // false
result = a <= 3; // a smaller or equal to 3 - true
result = b >= 5; // b bigger or equal to 5 - false
result = a == b; // a equal to b - false
result = a != b; // a is not equal to b - true
result = a > b || a < b; // Logical or - true
result = 2 < a && a < 5; // Logical and - true
result = !result; // Logical not - false

== and equals

• == is used to compare with primitive data type
• equals is used to compare with object data type

For example:

String a = new String("Hello");
String b = new String("Hello");
if (a.equals(b)) {
     System.out.println("It is true!");
}