Whenever we talk about Java 8, what comes in mind most often is ‘**Lambda**‘ and ‘**Streams**‘. Am I wrong? I don’t think so. Although these are the most prominent features that came with Java 8, there are other key things that came along too. So, we are going to talk about these less prominent but powerful and important features for any Java developer. These features are nothing but the changes that have been made in the ‘**Math**‘ class to support ‘**Exact Arithmetic**‘.

*Java 8 introduced new methods in the java.lang.Math class to handle overflows and throws ArithmeticException*. These methods are:

**addExact****substractExact****multiplyExact****incrementExact****decrementExact****negateExact**

All these methods take either int & long as arguments.

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**Let’s discuss first what these methods are:**

** 1. addExact –** Adding two arguments using the

*exact*method but will throw an

*arithmetic exception*if an overflow occurs.

1 2 3 4 5 6 7 8 9 10 11 | Ex 1.a System.out.println(Math.addExact(100,500)); Output: 600 Ex 1.b System.out.println(Math.addExact(100,Integer.MAX_VALUE)); Output: throws ArithmeticException |

** 2. subtractExact –** Subtracting the second argument from the first one but will throw an arithmetic Exception if an overflow occurs.

1 2 3 4 5 6 7 8 9 10 11 | Ex 2.a System.out.println(Math.subtractExact(100,1)); Output: 99 Ex 2.b System.out.println(Math.subtractExact(Integer.MIN_VALUE,1)); Output: throws ArithmeticException |

** 3. incrementExact –** Incrementing the argument by one but will throw an arithmetic exception if an overflow occurs.

1 2 3 4 5 6 7 8 9 10 11 | Ex 3.a System.out.println(Math.incrementExact(500)); Output: 501 Ex 3.b System.out.println(Math.incrementExact(Long.MAX_VALUE)); Output: throws ArithmeticException |

** 4. decrementExact –** Decrementing the argument by one but will throw an arithmetic exception if an overflow occurs.

1 2 3 4 5 6 7 8 9 10 11 | Ex 4.a System.out.println(Math.decrementExact(500)); Output: 499 Ex 4.b System.out.println(Math.decrementExact(Integer.MIN_VALUE)); Output: throws ArithmeticException |

** 5. multiplyExact –** Multiply the first and second argument but will throw an arithmetic exception if an overflow occurs.

1 2 3 4 5 6 7 8 9 10 11 | Ex 5.a System.out.println(Math.multiplyExact(10,50)); Output: 500 Ex 5.b System.out.println(Math.multiplyExact(Integer.MAX_VALUE,50)); Output: throws ArithmeticException |

** 6. negateExact –** Alter the sign of the argument but will throw an arithmetic exception if an overflow occurs.

1 2 3 4 5 6 7 8 9 10 11 | Ex 6.a System.out.println(Math.negateExact(500)); Output: -500 Ex 6.b System.out.println(Math.negateExact(Long.MIN_VALUE)); Output: throws ArithmeticException |

**Example:**

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | public class Math_JAVA8_Exact_Methods { public static void main(String[] args) { //Addition System.out.println(Math.addExact(100, Integer.MAX_VALUE)); //Subtraction System.out.println(Math.subtractExact(Integer.MIN_VALUE, 1)); //Increment System.out.println(Math.incrementExact(Long.MAX_VALUE)); //Decrement System.out.println(Math.decrementExact(Integer.MIN_VALUE)); //Multiplication System.out.println(Math.multiplyExact(Integer.MAX_VALUE, 50)); //Negate System.out.println(Math.negateExact(Long.MIN_VALUE)); } } |

That’s it. Java 8 Math Methods gives so much convenience to Java developers in order to handle exceptions in such situations that we described above.

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