?? string_int.java
字號:
package string_int;
public class String_int {
public static void main(String[] args) {
String s1="abc";
String s2="abc";
String s3=s1;
String s4=new String("abc");
String s5=new String(s1);
if (s1==s2)
System.out.println("s1==s2");
else
System.out.println("s1!=s2");
if (s3==s2)
System.out.println("s3==s2");
else
System.out.println("s3!=s2");
if (s4==s2)
System.out.println("s4==s2");
else
System.out.println("s4!=s2");
if (s5==s2)
System.out.println("s5==s2");
else
System.out.println("s5!=s2");
if (s5==s4)
System.out.println("s5==s4");
else
System.out.println("s5!=s4");
if (s1.equals(s2))
System.out.println("s1.equals(s2)");
else
System.out.println(" not s1.equals(s2)");
if (s1.equals(s3))
System.out.println("s1.equals(s3)");
else
System.out.println(" not s1.equals(s3)");
if (s4.equals(s3))
System.out.println("s4.equals(s3)");
else
System.out.println(" not s4.equals(s3)");
if (s5.equals(s2))
System.out.println("s5.equals(s2)");
else
System.out.println(" not s5.equals(s2)");
if (s5.equals(s4))
System.out.println("s5.equals(s4)");
else
System.out.println(" not s5.equals(s4)");
int i1=10,i2=10,i3=i1;
if(i1==i2)
System.out.println("i1==i2");
else
System.out.println("i1!=i2");
if(i1==i3)
System.out.println("i1==i3");
else
System.out.println("i1!=i3");
if(i2==i3)
System.out.println("i2==i3");
else
System.out.println("i2!=i3");
System.out.println("***********");
// if(i1.equals(i3))
// System.out.println("i2==i3");
// else
// System.out.println("i2!=i3");
Integer I1=33;
Integer I2=33;
Integer I3=I1;
Integer I6=new Integer(I1);
Integer I4=new Integer(8);
Integer I5=new Integer(8);
if(I1==I2)
System.out.println("I1==I2");
else
System.out.println("I1!=I2");
if(I1==I3)
System.out.println("I1==I3");
else
System.out.println("I1!=I3");
if(I2==I3)
System.out.println("I2==I3");
else
System.out.println("I2!=I3");
if(I1==I6)
System.out.println("I1==I6");
else
System.out.println("I1!=I6");
if(I4==I3)
System.out.println("I4==I3");
else
System.out.println("I4!=I3");
if(I4==I5)
System.out.println("I4==I5");
else
System.out.println("I4!=I5");
if(I1.equals(I3))
System.out.println("I1 equals I3");
else
System.out.println("not I1 equals I3");
if(I4.equals(I3))
System.out.println("I4 equals I3");
else
System.out.println("not I4 equals I3");
if(I4.equals(I5))
System.out.println("I4 equals I5");
else
System.out.println("not I4 equals I5");
}
}
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