class Autoboxing {
Byte b;
Short s;
Short sInterned;
Integer i;
Integer iInterned;
Long l;
Float f;
Double d;
Boolean z;
Character c;
Character cInterned;
Autoboxing() {
b = -126;
s = 32000;
sInterned = 32;
i = 1234567;
iInterned = 123;
l = 1234567L;
f = 3.14f;
d = 3.14;
z = true;
c = 65000;
cInterned = 65;
}
public static void main(String[] args) {
new Autoboxing().test();
}
public void test() {
System.out.println();
System.out.println("Byte");
Byte b1 = -126;
Byte b2 = -126;
Byte b3 = Byte.valueOf((byte) -126);
System.out.println(b1 == b2);
//:: warning: (unnecessary.equals)
System.out.println(b1.equals(b2));
//:: warning: (unnecessary.equals)
System.out.println(b3.equals(b2));
System.out.println(b.equals(b2));
System.out.println(b == -126);
//:: warning: (unnecessary.equals)
System.out.println(b1.equals(126));
System.out.println();
System.out.println("Short");
Short s1 = 32000;
Short s2 = 32000;
Short s3 = Short.valueOf((short) 32000);
//:: error: (not.interned)
System.out.println(s1 == s2);
System.out.println(s1.equals(s2));
System.out.println(s3.equals(s2));
System.out.println(s.equals(s2));
// TODO
// Short s1interned = 32;
// Short s2interned = 32;
// Short s3interned = Short.valueOf((short) 32);
// System.out.println(s1interned==s2interned);
// //:: warning: (unnecessary.equals)
// System.out.println(s1interned.equals(s2interned));
// //:: warning: (unnecessary.equals)
// System.out.println(s3interned.equals(s2interned));
// //:: warning: (unnecessary.equals)
// System.out.println(sInterned.equals(s2interned));
System.out.println();
System.out.println("Integer");
Integer i1 = 1234567;
Integer i2 = 1234567;
Integer i3 = Integer.valueOf(1234567);
//:: error: (not.interned)
System.out.println(i1 == i2);
System.out.println(i1.equals(i2));
System.out.println(i3.equals(i2));
System.out.println(i.equals(i2));
System.out.println();
Integer i1interned = 123;
Integer i2interned = 123;
Integer i3interned = Integer.valueOf(123);
// TODO:
// Would be legal to use ==, but Interning Checker does not check the
// actual int value when deciding whether to warn for unnecessary.equals.
// //:: warning: (unnecessary.equals)
// System.out.println(i1interned==i2interned);
// //:: warning: (unnecessary.equals)
// System.out.println(i1interned.equals(i2interned));
// //:: warning: (unnecessary.equals)
// System.out.println(i3interned.equals(i2interned));
// //:: warning: (unnecessary.equals)
// System.out.println(iInterned.equals(i2interned));
// System.out.println(i1interned==123); // ok
// //:: warning: (unnecessary.equals)
// System.out.println(i1interned.equals(123));
System.out.println();
System.out.println("Long");
Long l1 = 1234567L;
Long l2 = 1234567L;
Long l3 = Long.valueOf(1234567L);
//:: error: (not.interned)
System.out.println(l1 == l2);
System.out.println(l1.equals(l2));
System.out.println(l3.equals(l2));
System.out.println(l.equals(l2));
System.out.println();
System.out.println("Float");
Float f1 = 3.14f;
Float f2 = 3.14f;
Float f3 = Float.valueOf(3.14f);
//:: error: (not.interned)
System.out.println(f1 == f2);
System.out.println(f1.equals(f2));
System.out.println(f3.equals(f2));
System.out.println(f.equals(f2));
System.out.println();
System.out.println("Double");
Double d1 = 3.14;
Double d2 = 3.14;
Double d3 = Double.valueOf(3.14);
//:: error: (not.interned)
System.out.println(d1 == d2);
System.out.println(d1.equals(d2));
System.out.println(d3.equals(d2));
System.out.println(d.equals(d2));
System.out.println();
System.out.println("Boolean");
Boolean z1 = true;
Boolean z2 = true;
Boolean z3 = Boolean.valueOf(true);
System.out.println(z1 == z2);
//:: warning: (unnecessary.equals)
System.out.println(z1.equals(z2));
//:: warning: (unnecessary.equals)
System.out.println(z3.equals(z2));
System.out.println(z.equals(z2));
System.out.println(z1 == true); // ok
//:: warning: (unnecessary.equals)
System.out.println(z1.equals(true));
System.out.println();
System.out.println("Character");
Character c1 = 65000;
Character c2 = 65000;
Character c3 = Character.valueOf((char) 65000);
//:: error: (not.interned)
System.out.println(c1 == c2);
System.out.println(c1.equals(c2));
System.out.println(c3.equals(c2));
System.out.println(c.equals(c2));
// TODO
// Character c1interned = 65;
// Character c2interned = 65;
// Character c3interned = Character.valueOf((char) 65);
// System.out.println(c1interned==c2interned);
// //:: warning: (unnecessary.equals)
// System.out.println(c1interned.equals(c2interned));
// //:: warning: (unnecessary.equals)
// System.out.println(c3interned.equals(c2interned));
// //:: warning: (unnecessary.equals)
// System.out.println(cInterned.equals(c2interned));
}
}