public static void main(String[] args) {
Long long1 = new Long(1234);
Long long2 = long1;
// Does this compare references or actual values?
if (long1 == long2) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
// Displays "Equal"
long2 = new Long(1234);
// Let's create a new object with the same value to see if this works.
if (long1 == long2) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
// Displays "Not Equal"
// Let's compare the Long wrapper with its equivalent primitive.
if ((new Long(1234) == 1234) && (Long.valueOf(1234) == 1234)) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
// Displays "Equal"
long1 = Long.valueOf(1234);
long2 = Long.valueOf(1234);
// We've now used valueOf() instead of creating a new Long, just to see if it works.
if (long1 == long2) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
// Displays "Not Equal"
// Numbers in the range [-128, 127] are cached.
long1 = (Long.valueOf(127);
long2 = (Long.valueOf(127);
if (long1 == long2) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
// Displays "Equal"
// So let's prove it for numbers greater than 127.
if ((Long.valueOf(128) == Long.valueOf(128))) {
System.out.println("Equal");
} else {
System.out.println("Not Equal");
}
// Displays "Not Equal"
}
