String

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package week03;   import java.util.Scanner;   public class TestString {     public static void main(String[] args) {         Scanner sc = new Scanner(System.in);           String a = sc.nextLine();           //字符串变字符数组         /*char[] chars = a.toCharArray();         for(int i = 0; i < a.length(); i++)         {             System.out.print(chars[i]);         }*/           //字符数组变字符串         /*char[] chars = a.toCharArray();         String s = new String(chars);         System.out.println(s);*/           //截取子串         /*String substring = a.substring(1, 3);         System.out.println(substring);*/           //查看是否是子串         /*boolean ab = a.contains("ab");         System.out.println(ab);*/           //链接字符串，更多的用+         /*String concat = a.concat(a);         System.out.println(concat);*/           //串与stringbuffer比较         /*StringBuffer c = new StringBuffer("aba");         boolean b = a.contentEquals(c);         System.out.println(b);*/           //返回哈希值         /*int hash = a.hashCode();         System.out.println(hash);*/           //找值         /*int i = a.indexOf('c');         System.out.println(i);         int ab = a.indexOf("ab");         System.out.println(ab);*/           //不用草         /*int aba = a.compareTo("aaa");         System.out.println(aba);*/     } }