代码找茬

import java.util.Date;
import java.util.List;

public class Test extends Date{
    private List<?> listt;
    private List<? extends Date> listts;
    private List<? super Date> listtss;
    private List<String> lists;
}

Classfile /C:/Users/Test.class
  Last modified 2016-5-6; size 447 bytes
  MD5 checksum bff0b1a67765434597a856d0edb99486
  Compiled from "Test.java"
public class Test extends java.util.Date
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
   #1 = Methodref          #3.#20         // java/util/Date."<init>":()V
   #2 = Class              #21            // Test
   #3 = Class              #22            // java/util/Date
   #4 = Utf8               listt
   #5 = Utf8               Ljava/util/List;
   #6 = Utf8               Signature
   #7 = Utf8               Ljava/util/List<*>;
   #8 = Utf8               listts
   #9 = Utf8               Ljava/util/List<+Ljava/util/Date;>;
  #10 = Utf8               listtss
  #11 = Utf8               Ljava/util/List<-Ljava/util/Date;>;
  #12 = Utf8               lists
  #13 = Utf8               Ljava/util/List<Ljava/lang/String;>;
  #14 = Utf8               <init>
  #15 = Utf8               ()V
  #16 = Utf8               Code
  #17 = Utf8               LineNumberTable
  #18 = Utf8               SourceFile
  #19 = Utf8               Test.java
  #20 = NameAndType        #14:#15        // "<init>":()V
  #21 = Utf8               Test
  #22 = Utf8               java/util/Date
{
  public Test();
    descriptor: ()V
    flags: ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/util/Date."<init>":()V
         4: return
      LineNumberTable:
        line 4: 0
}
SourceFile: "Test.java"