String.intern()

Java

String.intern()

String intern

new

s1

String s1 = new String("") + new String("");

s1 intern()

Java 7 Java 8

String.intern() Java 7 String.intern() Java 7 String.intern()

String s1 = new String("");
String s2 = s1.intern();
System.out.println(s1 == s2);

s1

s1 intern() s2

s1 s2 false

false

String s1 = new String("") + new String("");
String s2 = s1.intern();
System.out.println(s1 == s2);

false

true

s1

s1 intern() s2 s1 true

true

intern

String s1 = new String("") + new String("")

1. ""
2. ""
3. new String("") ""
4. new String("") ""
5. new String("") + new String("") StringBuilder "" "" StringBuilder toString() ""

+ new String("") + new String("")

new StringBuilder().append("").append("").toString();

• StringBuilder
• StringBuilder append("") "" StringBuilder
• StringBuilder append("") "" StringBuilder
• StringBuilder toString() StringBuilder ""

StringBuilder

intern intern

StringTable

String intern

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