Java - Math.min() method example

The Math.min() function returns the smallest number from given numbers.

public class MathExample {

    public static void main(String[] args) {
        int min = Math.min(2, 5);
        System.out.println( min ); // 2

        System.out.println( Math.min(1, 2)     ); // 1
        System.out.println( Math.min(1.5, 2.0) ); // 1.5

        System.out.println( Math.min(2, Float.NaN) ); // NaN
    }
}

1. Documentation

package java.lang;

public final class Math {

    public static double min(double number1, double number2) { ... }
    public static float min(float number1, float number2) { ... }
    public static int min(int number1, int number2) { ... }
    public static long min(long number1, long number2) { ... }

}

2. Getting min value from array examples

2.1. With Collections.min method example

public class MathExample {

    public static void main(String[] args) {
        Integer[] numbersArray = { 1, 5, 2, 16, -5};

        int min = Collections.min( Arrays.asList(numbersArray) );
        System.out.println(  min  ); // -5
    }
}

2.2. By comparing all the elements in the array

public class MathExample {

    static double min(double[] array) {
        double result = Double.POSITIVE_INFINITY;
        for (double currentNumber : array) {
            if (result > currentNumber) result = currentNumber;
        }
        return result;
    }

    public static void main(String[] args) {
        double[] numbersArray = {1.4, 5.0, 2.2, 16.0, -5.0};

        System.out.println(  min(numbersArray) ); // -5.0
    }
}

References

1. Maxima and minima - Wikipedia