本文共 1059 字,大约阅读时间需要 3 分钟。
自动装箱是一种语法糖,发生在编译阶段,也就是生成的字节码是一致的。
public class Test22 { public static void main(String[] args) { Integer integer=1; int a=integer++; }}
反编译之后
Compiled from "Test22.java"public class Test22 { public Test22(); Code: 0: aload_0 1: invokespecial #1 // Method java/lang/Object."":()V 4: return public static void main(java.lang.String[]); Code: 0: iconst_1 1: invokestatic #2 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer; 4: astore_1 5: aload_1 6: astore_3 7: aload_1 8: invokevirtual #3 // Method java/lang/Integer.intValue:()I 11: iconst_1 12: iadd 13: invokestatic #2 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer; 16: dup 17: astore_1 18: astore 4 20: aload_3 21: invokevirtual #3 // Method java/lang/Integer.intValue:()I 24: istore_2 25: return}
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