import java.util.Arrays;

import java.util.Objects;

import static java.lang.System.gc;

import static java.lang.System.setOut;

public class EqualsANDDeepEquals {

public static void main(String[] args) {

long start = System.nanoTime();

Integer[] a = {1, 2};

Integer[] b = {1, 2};

Integer[] c = null;

System.out.println(Arrays.deepEquals(a, b)); // true

System.out.println(Objects.deepEquals(a, b)); // true

System.out.println(Objects.isNull(a)); // false

System.out.println(Objects.isNull(b)); // false

System.out.println(Objects.isNull(c)); // true

System.out.println(Objects.nonNull(c)); // false

System.out.println(Objects.nonNull(a)); // true

System.out.println(Objects.toString(a));

System.out.println(Objects.toString(a, "null 입니다."));

System.out.println(Objects.toString(c, "null 입니다."));

System.out.println(c);

long end = System.nanoTime();

System.out.println((end-start)+ " 소요됨");

System.out.println(System.getProperty("os.name"));

}

}