String and some of the difference between StringBuffer
2008-11-14 18:42
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1:效率方面:
a:StringBuffer必须通过关键字new出来,StringBuffer的append效率比String的+=的效率要高
b:String是一个final Class ,因此这个类是不能被继承,不能修改这个类,而StringBuffer不是.
2:编程方面:
a:改变StringBuffer和String对象的值的时候StringBuffer直接改变指向的地址中保留的值,而String对象改变的是指向的地址,原来的值不会改变.
c:String类中重新定义了Object对象中的equals这个方法比较的是两个对象的值,而StringBuffer类中并没有重新定义Object 对象的equal方法,比较两个对象的时候比较的是对象的地址.
a:StringBuffer必须通过关键字new出来,StringBuffer的append效率比String的+=的效率要高
b:String是一个final Class ,因此这个类是不能被继承,不能修改这个类,而StringBuffer不是.
2:编程方面:
a:改变StringBuffer和String对象的值的时候StringBuffer直接改变指向的地址中保留的值,而String对象改变的是指向的地址,原来的值不会改变.
c:String类中重新定义了Object对象中的equals这个方法比较的是两个对象的值,而StringBuffer类中并没有重新定义Object 对象的equal方法,比较两个对象的时候比较的是对象的地址.
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