i++ 与 ++i 的区别

package tmp;
public class Test {

public static void main(String[] args) {
    f1();
    f2();
}

private static void f2() {
    int i = 0;
    int j = ++i;
    System.out.println(j);
}

private static void f1() {
    int i = 0;
    int j = i++;
    System.out.println(j);
}

}

class tmp.Test
Minor version: 0
Major version: 52
Flags: PUBLIC, SUPER

public void <init>();
    Flags: PUBLIC
    Code:
              linenumber      3
           0: aload_0         /* this */
           1: invokespecial   java/lang/Object.<init>:()V
           4: return         

public static void main(java.lang.String[] args);
    Flags: PUBLIC, STATIC
    Code:
              linenumber      6
           0: invokestatic    tmp/Test.f1:()V
              linenumber      7
           3: invokestatic    tmp/Test.f2:()V
              linenumber      8
           6: return         

private static void f2();
    Flags: PRIVATE, STATIC
    Code:
              linenumber      11
           0: iconst_0       
           1: istore_0        /* i */
              linenumber      12
           2: iinc            i, 1
           5: iload_0         /* i */
           6: istore_1        /* j */
              linenumber      13
           7: getstatic       java/lang/System.out:Ljava/io/PrintStream;
          10: iload_1         /* j */
          11: invokevirtual   java/io/PrintStream.println:(I)V
              linenumber      14
          14: return         

private static void f1();
    Flags: PRIVATE, STATIC
    Code:
              linenumber      17
           0: iconst_0       
           1: istore_0        /* i */
              linenumber      18
           2: iload_0         /* i */
           3: iinc            i, 1
           6: istore_1        /* j */
              linenumber      19
           7: getstatic       java/lang/System.out:Ljava/io/PrintStream;
          10: iload_1         /* j */
          11: invokevirtual   java/io/PrintStream.println:(I)V
              linenumber      20
          14: return         

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