Java 语法糖 - 自动拆装箱
Java 面试 About 1,041 wordsJava 代码
public class Test {
public static void main(String[] args) {
Integer x = 1;
int y = x;
}
}
字节码
可以看到编译成字节码后会自动添加了Integer.valueOf
和Integer.intValue
。
1: invokestatic
:自动装箱,转为Integer
类型。
6: invokevirtual
:自动拆箱,转为int
类型。
public static void main(java.lang.String[]);
descriptor: ([Ljava/lang/String;)V
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=1, locals=3, args_size=1
0: iconst_1
1: invokestatic #2 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
4: astore_1
5: aload_1
6: invokevirtual #3 // Method java/lang/Integer.intValue:()I
9: istore_2
10: return
LineNumberTable:
line 5: 0
line 6: 5
line 7: 10
LocalVariableTable:
Start Length Slot Name Signature
0 11 0 args [Ljava/lang/String;
5 6 1 x Ljava/lang/Integer;
10 1 2 y I
MethodParameters:
Name Flags
args
Views: 1,349 · Posted: 2022-04-19
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