字节码
String s = “abc”,并没有在堆上生成对象
Object o = new Object() 对应字节码为:
0: new #2 // class java/lang/Object
3: dup
4: invokespecial #1 // Method java/lang/Object."<init>":()V
7: astore_1
String s = “abc” 对应字节码为:
0: ldc #2 // String abc
2: astore_1
String s = new String() 对应字节码为:
0: new #2 // class java/lang/String
3: dup
4: invokespecial #3 // Method java/lang/String."<init>":()V
7: astore_1