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Friday, 12 May 2017 02:40

Operators in java

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Operator in java is a symbol that is used to perform operations. For example: +, -, *, / etc.

 

There are many types of operators in java which are given below:

  • Unary Operator,
  • Arithmetic Operator,
  • shift Operator,
  • Relational Operator,
  • Bitwise Operator,
  • Logical Operator,
  • Ternary Operator and
  • Assignment Operator.

Java Operator Precedence

Operator Type Category Precedence
Unary postfix expr++ expr--
prefix ++expr --expr +expr -expr ~ !
Arithmetic multiplicative * / %
additive + -
Shift shift << >> >>>
Relational comparison < > <= >= instanceof
equality == !=
Bitwise bitwise AND &
bitwise exclusive OR ^
bitwise inclusive OR |
Logical logical AND &&
logical OR ||
Ternary ternary ? :
Assignment assignment = += -= *= /= %= &= ^= |= <<= >>= >>>=

Java Unary Operator Example: ++ and --

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int x=10;  
  4. System.out.println(x++);//10 (11)  
  5. System.out.println(++x);//12  
  6. System.out.println(x--);//12 (11)  
  7. System.out.println(--x);//10  
  8. }}  

Output:

10
12
12
10

Java Unary Operator Example 2: ++ and --

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=10;  
  5. System.out.println(a++ + ++a);//10+12=22  
  6. System.out.println(b++ + b++);//10+11=21  
  7.   
  8. }}  

Output:

22
21

Java Unary Operator Example: ~ and !

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=-10;  
  5. boolean c=true;  
  6. boolean d=false;  
  7. System.out.println(~a);//-11 (minus of total positive value which starts from 0)  
  8. System.out.println(~b);//9 (positive of total minus, positive starts from 0)  
  9. System.out.println(!c);//false (opposite of boolean value)  
  10. System.out.println(!d);//true  
  11. }}  

Output:

-11
9
false
true

Java Arithmetic Operator Example

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=5;  
  5. System.out.println(a+b);//15  
  6. System.out.println(a-b);//5  
  7. System.out.println(a*b);//50  
  8. System.out.println(a/b);//2  
  9. System.out.println(a%b);//0  
  10. }}  

Output:

15
5
50
2
0

Java Arithmetic Operator Example: Expression

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. System.out.println(10*10/5+3-1*4/2);  
  4. }}  

Output:

21

Java Shift Operator Example: Left Shift

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. System.out.println(10<<2);//10*2^2=10*4=40  
  4. System.out.println(10<<3);//10*2^3=10*8=80  
  5. System.out.println(20<<2);//20*2^2=20*4=80  
  6. System.out.println(15<<4);//15*2^4=15*16=240  
  7. }}  

Output:

40
80
80
240

Java Shift Operator Example: Right Shift

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. System.out.println(10>>2);//10/2^2=10/4=2  
  4. System.out.println(20>>2);//20/2^2=20/4=5  
  5. System.out.println(20>>3);//20/2^3=20/8=2  
  6. }}  

Output:

2
5
2

Java Shift Operator Example: >> vs >>>

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3.     //For positive number, >> and >>> works same  
  4.     System.out.println(20>>2);  
  5.     System.out.println(20>>>2);  
  6.     //For nagative number, >>> changes parity bit (MSB) to 0  
  7.     System.out.println(-20>>2);  
  8.     System.out.println(-20>>>2);  
  9. }}  

Output:

5
5
-5
1073741819

Java AND Operator Example: Logical && and Bitwise &

The logical && operator doesn't check second condition if first condition is false. It checks second condition only if first one is true.

The bitwise & operator always checks both conditions whether first condition is true or false.

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=5;  
  5. int c=20;  
  6. System.out.println(a<b&&a<c);//false && true = false  
  7. System.out.println(a<b&a<c);//false & true = false  
  8. }}  

Output:

false
false

Java AND Operator Example: Logical && vs Bitwise &

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=5;  
  5. int c=20;  
  6. System.out.println(a<b&&a++<c);//false && true = false  
  7. System.out.println(a);//10 because second condition is not checked  
  8. System.out.println(a<b&a++<c);//false && true = false  
  9. System.out.println(a);//11 because second condition is checked  
  10. }}  

Output:

false
10
false
11

Java OR Operator Example: Logical || and Bitwise |

The logical || operator doesn't check second condition if first condition is true. It checks second condition only if first one is false.

The bitwise | operator always checks both conditions whether first condition is true or false.

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=5;  
  5. int c=20;  
  6. System.out.println(a>b||a<c);//true || true = true  
  7. System.out.println(a>b|a<c);//true | true = true  
  8. //|| vs |  
  9. System.out.println(a>b||a++<c);//true || true = true  
  10. System.out.println(a);//10 because second condition is not checked  
  11. System.out.println(a>b|a++<c);//true | true = true  
  12. System.out.println(a);//11 because second condition is checked  
  13. }}  

Output:

true
true
true
10
true
11

Java Ternary Operator Example

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=2;  
  4. int b=5;  
  5. int min=(a<b)?a:b;  
  6. System.out.println(min);  
  7. }}  

Output:

2

Another Example:

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=5;  
  5. int min=(a<b)?a:b;  
  6. System.out.println(min);  
  7. }}  

Output:

5

Java Assignment Operator Example

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. int a=10;  
  4. int b=20;  
  5. a+=4;//a=a+4 (a=10+4)  
  6. b-=4;//b=b-4 (b=20-4)  
  7. System.out.println(a);  
  8. System.out.println(b);  
  9. }}  

Output:

14
16

Java Assignment Operator Example

 
  1. class OperatorExample{  
  2. public static void main(String[] args){  
  3. int a=10;  
  4. a+=3;//10+3  
  5. System.out.println(a);  
  6. a-=4;//13-4  
  7. System.out.println(a);  
  8. a*=2;//9*2  
  9. System.out.println(a);  
  10. a/=2;//18/2  
  11. System.out.println(a);  
  12. }}  

Output:

13
9
18
9

Java Assignment Operator Example: Adding short

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. short a=10;  
  4. short b=10;  
  5. //a+=b;//a=a+b internally so fine  
  6. a=a+b;//Compile time error because 10+10=20 now int  
  7. System.out.println(a);  
  8. }}  

Output:

Compile time error

After type cast:

 
  1. class OperatorExample{  
  2. public static void main(String args[]){  
  3. short a=10;  
  4. short b=10;  
  5. a=(short)(a+b);//20 which is int now converted to short  
  6. System.out.println(a);  
  7. }}  

Output:

20
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