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ืืืฆื ืืืฉืืืช ื ืืื ืืื ืฉืชื ืืืจืืืืช ื-Java?
ืืฉืืื
equals
ืืืืงืช ืื ืืืืจืืืืช ืชืืืืืช.boolean equals (Object o) String s = "cat"; boolean test1 = s.equals("cat");//true boolean test2 = s.equals("Cat");//false boolean test3 = s.equals("c"+"a"+"t");//true
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ืืืฆื ืืืฉืืืช ื ืืื ืืื ืฉืชื ืืืจืืืืช ื-Java, ืชืื ืืชืขืืืืช ืืจืืฉืืืช?
ืฉืืื
equalsIgnoreCase
- ืืื ืืืืจืืืืช ืชืืืืืช, ืชืื ืืชืขืืืืช ืืืืชืืืช ืืืืืืช.boolean equalsIgnoreCase (String str) String s = "cat"; boolean test1 = s.equalsIgnoreCase("cat");//true boolean test2 = s.equalsIgnoreCase("Cat");//true boolean test3 = s.equalsIgnoreCase("cAT");//true
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ืืืฆื ืืืืื ืจืฉืืื ืฉื ืืืจืืืืช ืืคื ืืืคืืืชื?
ืืฉืชืืฉ ื
Collections.sort()
.ArrayList
list = new ArrayList<>(); list.add("zas"); list.add("fas"); list.add("sd"); list.add("asdg"); Collections.sort(list); -
ืืืืื ืงืืืื ืืืืืกื ืืช ืืืจืืืืช ื-Java?
ืืืจืืืืช ื-java ืืืืืกื ืืช ื-Unicode.
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ืืืฆื ืืืืืจ ืืืจืืืช ืืงืืืื Windows-1251?
String utf8 = "text"; byte[] bytes1251 = utf8.getBytes("windows-1251"); String win1251 = new String(bytes1251,"windows-1251");
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ืืื ืืคืฆื ืืืจืืืช ืืืืืื ืืืืืืช?
String[] split(String regex)
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StringTokenizer:
String s = "Good news everyone!"; StringTokenizer tokenizer = new StringTokenizer(s,"ne"); while (tokenizer.hasMoreTokens()) { String token = tokenizer.nextToken(); System.out.println(token); }
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ืืื ืืืจืืื ืืืจืืืช ืืืืืจ?
String s = "Bender"; StringBuilder s2 = new StringBuilder(s); s2.reverse(); //ะฑัะดะตั "redneB";
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ืื ืงืืจื ืืฉืื ื ืืืชืืื "A"+"b"+"C"?
ืืฉืื ืืื:
new StringBuilder().append("A").append("b").append("C").toString();
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ืืื
mutable
ืืกืืืืimmutable
?ืืืืืืงืืื ืฉืื ื ืืชื ืืฉื ืืช ืืืืจ ืืฆืืจืชื ื ืงืจืืื ืืืชื ื ืืชื ืื ืืฉืื ืื ืื
immutable
.ืืืืืืงืืื ืฉื ืืชื ืืฉื ืืช ืืืืจ ืืฆืืจืชื ื ืงืจืืื ืืฉืชื ืื ืื
mutable
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ืื ืื ื ืืชื ืืกืื
String
ืฉืืื ื ืืฆืจimmutable
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ืึผึฐืึดืืืึผืช.
String
ืืฉืืืืฉ ื ืจืื ืืคืจืืืจ ืขืืืจ ืืืืงืืช ื'ืืืื ืจืืืช, ืืคืจื ืืคืชืืืช ืืืืืจื ืจืฉืช, ืืืืืจื ืืกื ื ืชืื ืื, ืคืชืืืช ืงืืฆืื ืืื'. ืืื ืืฉืืจื ืืืืชื ืฉืื ื, ืื ื ืืื ืืืฉืช ืืืืืืืงื (ืงืืืฅ ืืืฉื) ืฉืืืื ืืฉ ืื ื ืืช ืืืืืช , ืืืืจ ืืื ืฉื ื ืืช ืืฉืืจื ืขื ืืฉื (ืืืขืืช ืื ืืืืื ื) ืืงืื ืืืฉื ืืงืืืฅ ืืืจ.ืืื ืืฉืืฉ ืื
String
ืืื ืื ืื ืืขืืืช ืงืืฆืื, ืืืื ืืืื ืืกืืกื. ืืื ืืฉืืจื ืืืืชื ืืฉืชื ื, ืืืงืฉื ืืืขืื ืช " java.io.Writer " ืืืืื ืืืฉืชื ืืช ื- " DiskErasingWriter ". -
Hashcode
ืืืืืื ืฉืืืืจืืืช ืื ืืฉืชื ื, ืืื ืืืืกื ืช ืืช ื-hashcode ืฉืื ืืืืืื ืืื ืืืฉืืช ืืืชื ืืื ืคืขื ืฉืื ื ืงืืจืืื ืื, ืื ืฉืืืคื ืืช ืืืืจืืืช ืืืืืจื ืืืื ืืืคืชื ืขืืืจ
hashmap
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ืจืืืื ืืฉืจืฉืืจืื
immutable
ืืืคื ืืืคืขื ืืืจืืืช ืืืืืืื.
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JavaRush
/ืืืื Java
/Random-HE
/ืจืื 22. ืชืฉืืืืช ืืฉืืืืช ืจืืืื ืื ืืฉื ืืจืื
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