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深入理解JAVA常量池
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*
1.
Integer i1 = 127;
Integer i2 = 127;
System.out.println(i1 == i2);
true
false
*
2.
Integer i3 = 128;
Integer i4 = 128;
System.out.println(i3 == i4);
true
false
*
3.
Character c1 = 'a';
Character c2 = 'a';
System.out.println(c1 == c2);
true
false
*
4.
Boolean e1 = false;
Boolean e2 = false;
System.out.println(e1 == e2);
true
false
*
5.
Double g1 = 1.0;
Double g2 = 1.0;
System.out.println(g1 == g2);
true
false
*
6.
Integer i4 = new Integer(40);
Integer i5 = new Integer(40);
Integer i6 = new Integer(0);
System.out.println(i4 == i5 + i6);
true
false
*
7.
Integer i5 = new Integer(40);
Integer i6 = new Integer(0);
System.out.println(40 == i5 + i6);
true
false
*
8.
String s1 = "hello";
String s2 = "he" + "llo";
System.out.println(s1 == s2);
true
false
*
9.
String a = "ab";
final String bb = "b";
String b = "a" + bb;
System.out.println(a == b);
true
false
*
10.
String s = "he" + "llo";
String a = "he";
String b = "llo";
String s1 = a + b;
System.out.println(s == s1);
true
false
*
11.
String s1 = new String("he") + new String("llo");
s1.intern();
String s2 = "hello";
System.out.println(s1 == s2);
true
false
*
12.
String s1 = new String("he") + new String("llo");
String s3 = new String("hello");
s1.intern();
String s2 = "hello";
System.out.println(s1 == s2);
true
false
*
13.
String s1 = new String("he") + new String("llo");
s1.intern();
String s3 = new String("hello");
String s2 = "hello";
System.out.println(s1 == s2);
true
false
*
14.
String str1 = new StringBuilder("he").append("llo").toString();
System.out.println(str1 == str1.intern());
true
false
*
15.
String str2 = new StringBuilder("ja").append("va").toString();
System.out.println(str2 == str2.intern());
true
false
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