Question

使用Java的String类操作字符串和子串。

Answer 1

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