javahum
发贴: 4
积分: 0
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于 2005-12-11 16:58
question1:String s1="aa";创建了几个String对象?String s2=new String("aa");又创建了几个String对象?两句话有什么区别? question2: String s1="aa" ;String s2="aa" 创建了几个String对象?String s1=new String("aa"); String s2=new String("aa");又创建了几个对象??
question3: //////test equals and == Test1.java class Test1{ pulic static void main(String []args){ String s1=new String("aa"); String s2=new String("aa"); System.out.println("s1==s2"+(s1==s2)); System.out.println("s1.equals(s2)"+s1.equals(s2)); } } --------------result:---------------
s1==s2false s1.equals(s2)true
class Test2{ pulic static void main(String []args){ String s1="aa" String s2="aa" System.out.println("s1==s2"+(s1==s2)); System.out.println("s1.equals(s2)"+s1.equals(s2)); } } ------------result--------
s1==s2true s1.equals(s2)true
Do explain why it is so here ????
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