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                ### 標記-清除算法(Mark-Sweep) 標記-清除算法(Mark-Sweep)是最基礎的垃圾收集算法(兩個階段:先標記后清除) 標記-清除算法可分為兩個階段: * 標記階段:標記出所有可回收的對象 * 清除階段:回收所有已標記的對象,釋放這部分空間 #### 缺點 * 效率問題:標記和清除的效率都不高 * 空間問題:標記清除后會產生大量不連續的內存碎片,碎片太多會導致以后在程序運行過程中需要分配較大對象時,沒有足夠的連續內存而不得不提前觸發另一次垃圾收集動作
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