public class TestNoSync {
public static void main(String[] args) throws IOException {
Integer i1 = 100;
Integer i2 = 100;
Integer i3 = 130;
Integer i4 = 130;
Long l1 = 110L;
Long l2 = 110L;
Byte b1 = 110;
Byte b2 = 110;
Short s1 = 110;
Short s2 = 110;
Character c1 = 110;
Character c2 = 110;
System.out.println(i1 == i2);
System.out.println(i3 == i4);
System.out.println(l1 == l2);
System.out.println(b1 == b2);
System.out.println(s1 == s2);
System.out.println(c1 == c2);
}
}
console：
true false true true true true
总结：
- 如果整型字面量的值在-128~127之间，那么不会new出新的Integer对象，而是直接使用常量池中的Integer对象
- Byte，Long，Short，Character也同样适用