運行時常量池主要回收的是廢棄的常量。
假如在常量池中存在字符串 “abc”,如果當前沒有任何String對象引用該字符串常量的話,就說明常量 “abc” 就是廢棄常量,如果這時發生內存回收的話而且有必要的話,“abc” 就會被系統清理出常量池。
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