[数据结构有关字符串的面试题求解答]建一张hash表，记录a-z 26个字母的出现次数 char table[ 26 ] ; 第一题，假设第一个字符串为s1，第2个字符串为s2 for( i = 0 ; i table[ i ] = 0 ; for( i = 0 ; i table[ s1[i]...+阅读

public class Du02 {

public static void main(String[] args) {

String str = ＂I am a student,I am at ccit＂;

System.out.println(str.length());

System.out.println(str.charAt(0));

System.out.println(str.charAt(str.length()-1));//

int firstIndex = str.indexOf(＂ ＂);

System.out.println(＂First word: ＂ + str.substring(0, firstIndex));

int lastIndex = str.lastIndexOf(＂ ＂);

System.out.println(＂Last word: ＂ + str.substring(lastIndex));

System.out.println(str.replace('c', 'C')); //

String[] ary = str.replace(＂,＂, ＂ ＂).split(＂\\s+＂);

for(int i =0; i < ary.length; i++){

if(!ary[i].trim().equals(＂＂)){

System.out.println(ary[i].trim());

}

}

System.out.println(＂String contains ma? ＂ + str.concat(＂ ma ＂));

System.out.println(＂String starts with 'i', ends with 'i'? ＂ + str.matches(＂I(.)*I＂));

}

}

-----------testing

27

I

t

First word: I

Last word: ccit

I am a student,I am at CCit

I

am

a

student

I

am

at

ccit

String contains ma? I am a student,I am at ccit ma

String starts with 'i', ends with 'i'? false

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