[Java]判断Integer值相等最好不用==最好使用equals

Integer c = ;
Integer d = ;
Integer e = ;
Integer f = ; System.out.println(c == d);
System.out.println(e == f);

true false

static final Integer cache[] = new Integer[-(-) + + ];
static {
for(int i = ; i < cache.length; i++)
cache[i] = new Integer(i - );
}
}