Core Java

1. Assignment Operator

You can change the value of a variable in your program by using an assignment statement, which has the general form:

Syntax: target=expression

a = 10;
b = a;
c = (x - 2)/(2 + 2);

2. Arithmetic Operators

Arithmetic operators are used for basic mathematical operations.

public class ArithmeticExample {
 public static void main(String[] args) {
   int num1, num2, add, sub, multi, div, modu;
   num1 = 5;
   num2 = 2;
   add = num1 + num2;
   sub = num1 - num2;
   multi = num1 * num2;
   div = num1 / num2;
   modu = num1 % num2;
   System.out.println("Addition = " + add);
   System.out.println("Subtraction = " + sub);
   System.out.println("Multiplication = " + multi);
   System.out.println("Division = " + div);
   System.out.println("Modulus = " + modu);
 }
}

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3. Relational Operators

There are six relational operators that compare values of other types and produce a boolean result:

public class RelationalExample {
 public static void main(String args[]) {
   int a, b, c;
   a = 1;
   b = 2;
   System.out.println("a = " + a);
   System.out.println("b = " + b);
   System.out.println("a < b is " +( a<b)); System.out.println("a > b is " +( a>b));
   System.out.println("a == c is " +( a==c));
   System.out.println("a <= c is " +( a<=c)); System.out.println("a >= b is " +( a>=b));
   System.out.println("b != c is " +( b!=c));
   System.out.println("b == a+c is " +( b==a+c));
 }
}

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4. Logical Operators

There are three logical operators in Java, these are.

public class LogicalExample {
  public static void main(String args[]) {
    boolean a = true;
    boolean b = false;
    System.out.println("a && b = " + (a&&b));
    System.out.println("a || b = " + (a||b) );
    System.out.println("!(a && b) = " + !(a && b));
  }
}

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5. Increment and Decrement Operator

The ++ and — are increment and decrement operator in java, respectively.

The increment operator increase its operand by one. The decrement operator decreases its operand by one. By using increment operator we can write

x = x+1; as x++;

Both have the same meaning. In the same way, the statement:

x = x-1; as x--;

public class IncrementOperator {
  public static void main (String args[]) {
    int a = 1;
    int b = 2;
    int c;
    int d;
    c = ++b;
    d = a++;
    c++;
    System.out.println("a = " + a);
    System.out.println("b = " + b);
    System.out.println("c = " + c);
    System.out.println("d = " + d);
  }
}

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6. Compound Assignment Operators

These are also called the Shorthand operators because it somewhat simplify the use of the operators and the assignment operation.

public class ArithAssignOperator
{
  public static void main(String[] args)
  {
    int a = 10, b = 15, c = 15;
    System.out.println("Arithmeic Assignment operators");
    System.out.println(" Addition = " + (a += b));
    System.out.println(" Subtraction = " + (c -= b));
    System.out.println(" Division = " + (a /= 2));
    System.out.println(" Multiplication = " + (a *= 2));
  }
}

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