class ?ASD（）{StringBuffer a =new?StringBuffer("A");StringBuffer b =new?StringBuffer("B");}main....方法中調(diào)用上述方法a.append(b);輸出是AB?a=b; 為什么這個(gè)輸出來 不管a=b還是b=a書出來都是 B 呢
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ycwiacb
TA貢獻(xiàn)11條經(jīng)驗(yàn) 獲得超3個(gè)贊
public?class?ASD
{
????static?StringBuffer?a?=new?StringBuffer("A");
????static?StringBuffer?b?=new?StringBuffer("B");
????public?static?void?main(String[]?args)?
????{
????????System.out.println("a?=?"?+?a);
????????System.out.println("b?=?"?+?b);
????????a.append(b);
????????System.out.println("a?=?"?+?a);
????????System.out.println("b?=?"?+?b);
????????b?=?a;
????????System.out.println("a?=?"?+?a);
????????System.out.println("b?=?"?+?b);
????}
}我運(yùn)行出來沒有任何問題
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