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作了个小测试equals 和＝＝ |
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作者：未知 来源：月光软件站 加入时间：2005-2-28 月光软件站 |
public class Sample{
long length;
public Sample(long l){length = l;}
public static void main(String arg[]){
Sample s1,s2,s3;
s1=new Sample(21L);
s2=new Sample(21L);
s3=s2;
String st1="hello";
String st2="hello";
String st3= new String("hello");
int i=3;
Integer j=new Integer(3);
float f =3.000f;
Float fl =new Float(3.0f);
Float f2 =new Float(3.0f);
long m=21L;
System.out.println(fl.equals(i));//false
System.out.println(j.equals(f));//false
System.out.println(s1.equals(s2));//true??false!!!!!
System.out.println(fl.equals(f2));//true
System.out.println(s2==s3);//true
System.out.println(s1==s3);//false
System.out.println(st1==st2);//true
System.out.println(st3==st2);//false
System.out.println(fl.equals(3));//false
System.out.println(fl==f);//true
if(i==f) System.out.println("equal1");//do
if(i==fl) System.out.println("equal2");//do
if(f2==fl) System.out.println("equal3");//undo
if(i==f2) System.out.println("equal4");//do
//if(s1==fl)System.out.println("equal3");cannot be compiled!
}
}
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