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public class Main { public static void main ( String [ ] args ) { String strSearch = " This is the string in which you have to search for a substring. " ; String substring = " substring " ; boolean found = false ; int max = strSearch . length ( ) - substring . length ( ) ; testlbl : for ( int i = 0 ; i <= max ; i ++ ) { int length = substring . length ( ) ; int j = i ; int k = 0 ; while ( length -- != 0 ) { if ( strSearch . charAt ( j ++ ) != substring . charAt ( k ++ ) ) { continue testlbl ; found = true ; break testlbl ; if ( found ) { System . out . println ( " 发现子字符串。 " ) ; else { System . out . println ( " 字符串中没有发现子字符串。 " ) ;

以上代码运行输出结果为:

发现子字符串。

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