用来替换之前匿名内部类的书写. 原先的:

f0749116253c5e2d71db2978896de039_MD5

现在:

c2af2bc51e9629d5000d0f174e070e43_MD5

f81f371df544e53f6e5844d7607a0aac_MD5

a655521aa88a6cf8c4f2551fbeb5f7b7_MD5

4ae42a63696efbe58ab9ff41a0aee673_MD5

91f074e049633e8a43339db5685ff589_MD5

还可以省略:

d85af22cf72082956eef0a7cf8a53db7_MD5

d503c62a6049886129d0054ef282ec78_MD5

b25bb9f9ddf18fd721e3c3910c8a6aa6_MD5