Java 字符串方法equals，equalsIgnoreCase，compareTo和regionMatches。
字符串方法equals，equalsIgnoreCase，compareTo和regionMatches。
实例源码：
源代码：
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public class Main 3
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{/* from 时 代 J a v a - nowjava.com*/5
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public static void main(String[] args)7
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{9
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String s1 = new String("hello"); // s1 is a copy of "hello"11
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String s2 = "this is a test";13
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String s3 = "Happy Birthday";15
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String s4 = "happy birthday";17
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System.out.printf(20
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"s1 = %s\ns2 = %s\ns3 = %s\ns4 = %s\n\n", s1, s2, s3, s4);22
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// test for equality25
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if (s1.equals("hello")) // true27
/*来自 28
时 代 J a v a 公 众 号 - nowjava.com*/29
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System.out.println("s1 equals \"hello\"");31
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else33
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System.out.println("s1 does not equal \"hello\""); 35
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// test for equality with ==38
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if (s1 == "hello") // false; they are not the same object40
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System.out.println("s1 is the same object as \"hello\"");42
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else44
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System.out.println("s1 is not the same object as \"hello\"");46
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// test for equality (ignore case)49
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if (s3.equalsIgnoreCase(s4)) // true51
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System.out.printf("%s equals %s with case ignored\n", s3, s4);53
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else55
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System.out.println("s3 does not equal s4");57
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// test compareTo60
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System.out.printf(62
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"\ns1.compareTo(s2) is %d", s1.compareTo(s2));64
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System.out.printf(66
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"\ns2.compareTo(s1) is %d", s2.compareTo(s1));68
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System.out.printf(70
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"\ns1.compareTo(s1) is %d", s1.compareTo(s1));72
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System.out.printf(74
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"\ns3.compareTo(s4) is %d", s3.compareTo(s4));76
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System.out.printf(78
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"\ns4.compareTo(s3) is %d\n\n", s4.compareTo(s3));80
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// test regionMatches (case sensitive)83
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if (s3.regionMatches(0, s4, 0, 5))85
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System.out.println("First 5 characters of s3 and s4 match");87
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else89
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System.out.println(91
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