从字节码角度解释i++和++i

  @Test
    public void test2(){
        int i = 10;
        i = i++;
        System.out.println(i);
    }

 0 bipush 10
 2 istore_1
 3 iload_1
 4 iinc 1 by 1
 7 istore_1
 8 getstatic #2 <java/lang/System.out : Ljava/io/PrintStream;>
11 iload_1
12 invokevirtual #3 <java/io/PrintStream.println : (I)V>
15 return

 0 bipush 10
 2 istore_1
 3 iinc 1 by 1
 6 iload_1
 7 istore_1
 8 getstatic #2 <java/lang/System.out : Ljava/io/PrintStream;>
11 iload_1
12 invokevirtual #3 <java/io/PrintStream.println : (I)V>
15 return