A.字符賦值頻繁使用StringBuilder B.當(dāng)字符賦值少使用String C.需要拼接的用戶String D.當(dāng)多個(gè)線程同步操作數(shù)據(jù),使用StringBuffer
A.MainActivity::class.java B.MainActivity:class.java C.MainActivity.class D.classOf(MainActivity)
A.MainActivity.this B.this@MainActivity C.this D.MainActivity@this