static void show(String desc, Integer n1, Integer n2) {

System.out.println(desc + ":");

System.out.printf(

"%d==%d %b %b%n", n1, n2, n1 == n2, n1.equals(n2));

}

@SuppressWarnings("deprecation")

public static void test(int value) {

Integer i1 = value; // [1]

Integer i2 = value;

show("Automatic", i1, i2);

// Old way, deprecated in Java 9 and on:

Integer r1 = new Integer(value); // [2]

Integer r2 = new Integer(value);

show("new Integer()", r1, r2);

// Preferred in Java 9 and on:

Integer v1 = Integer.valueOf(value); // [3]

Integer v2 = Integer.valueOf(value);

show("Integer.valueOf()", v1, v2);

// Primitives can't use equals():

int x = value; // [4]

int y = value;

// x.equals(y); // Doesn't compile

System.out.println("Primitive int:");

System.out.printf("%d==%d %b%n", x, y, x == y);

}

public static void main(String[] args) {

test(127);

test(128);

}