String addition and Special Operators in Java.

In this article, String addition and Special Operators in Java are explained in detail with examples.
This operator is '+'. It is used to add or concate two or more string as a single string.

Ex

"Hello"+"World" =>"Helloworld"

It is also used to add a string with any value/variable and form a new string.

Ex

"sum is: "+(a+b)

Here value or variable is of any data type.

// program related to String addition and Special Operators in Java-string addition operator.

class StringAddition

{

public static void main(String args[])

{

String s1="Hello"+"world";

String s2="Hello"+"Beautiful"+"World";

System.out.println(s1+s2);

boolean flag=true;

byte b=10;

short s=100;

int i=1000;

long l=10000l;

float f=5.66f;

double d=3.1456;

char ch='A';

System.out.println("Boolean value is: "+flag);

System.out.println("Byte value is: "+b);

System.out.println("Short value is: "+s);

System.out.println("Int value is: "+i);

System.out.println("Long value is: "+l);

System.out.println("Float value is: "+f);

System.out.println("Double value is: "+d);

System.out.println("char value is: "+ch);

}

}

Output

HelloworldHelloBeautifulWorld

Boolean value is: true

Byte value is: 10

Short value is: 100

Int value is: 1000

Long value is: 10000

Float value is: 5.66

Double value is: 3.1456

char value is: A

                           To get the code file use me.

Special Operators in Java.

These operators are used to perform special operations based on usage.They are two types

• Dot operator.
• Instanceof operator.

Dot Operator: This is used to access numbers of a class using object of that class.

Ex

obj.rollno=1001;

obj.name="sai";

obj.display();

It is also used to separate package with sub package, while importing/creating packages.

Ex

import.java.util.*; //importing a package.

import.java.sql.*;

package java.java1; //Creating a new package.

Instanceof operator: This is used to check whether a particular object belongs to that class or not in inheritance. (From topic String addition and Special Operators in Java)

Syntax

(object) instanceof (class name)

It returns "True/false" based on the comparison.

*Instanceof is also a relational operator.

Ex

// program related to String addition and Special Operators in Java-Instanceof operator.

class InstanceofOperator //this program shows how a instance of operator is used.

{

public static void main(String args[])

{

A a=new A();

B b=new B();

C c=new C();

boolean flag;

flag=(a instanceof A);

System.out.println("a instanceof A: "+flag);

flag=(b instanceof B);

System.out.println("b instanceof B: "+flag);

flag=(c instanceof C);

System.out.println("c instanceof C: "+flag);

}

}

class A

{

}

class B

{

}

class C

{

}

Output

                            To get the code file use me.

Continue to next topic Typecasting in Java.

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