절댓값

import java.lang.Math;

public class Driver {
    public static void main(String[] args) {
        System.out.println(Math.abs(-10)); // 10
        System.out.println(Math.abs(8)); // 8
    }
}

최솟값, 최댓값

import java.lang.Math;

public class Driver {
    public static void main(String[] args) {
        System.out.println(Math.min(4, 10));  // 4
        System.out.println(Math.max(4, 10));  // 10
    }
}