如果要查看lambda主体的代码a*a+2*a+1，则应调用javap -c -v -p t以查看 私有 方法：
private static java.lang.Integer lambda$main$0(java.lang.Integer);
descriptor: (Ljava/lang/Integer;)Ljava/lang/Integer;
flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
Code:
stack=3, locals=1, args_size=1
0: aload_0
1: invokevirtual #7 // Method java/lang/Integer.intValue:()I
4: aload_0
5: invokevirtual #7 // Method java/lang/Integer.intValue:()I
8: imul
9: iconst_2
10: aload_0
11: invokevirtual #7 // Method java/lang/Integer.intValue:()I
14: imul
15: iadd
16: iconst_1
17: iadd
18: invokestatic #4 // Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
21: areturn
LineNumberTable:
line 4: 0
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