Java字符串反转 关于Java字符串反转问题
java\u4e2d\u5982\u4f55\u5c06\u5b57\u7b26\u4e32\u53cd\u8f6c\uff1fpackage string;
public class StringTest3 {
public static void main(String[] args)
{
String s="abcdefg";
String s2="";
char[] cs=s.toCharArray();
for(int i=cs.length-1;i>=0;i--)
{
s2=s2+cs[i];
}
System.out.println("\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u53cd\u8f6c\u64cd\u4f5c\u540e\u4e3a:"+s2);
StringBuffer sb=new StringBuffer("abcdefg");
StringBuffer sb2=sb.reverse();
System.out.println("\u5bf9StringBuffer\u8fdb\u884c\u53cd\u8f6c\u64cd\u4f5c\u540e\u4e3a:"+sb2);
}
}
\u8fd9\u4e2a\u65b9\u6cd5\u662f\u4e2a\u9012\u5f52\u8c03\u7528\u3002
public static String reverseString(String s){
if(s.length()<2||s==null) return s; //\u5982\u679c\u7a7a\u4e32\u6216\u8005\u53ea\u6709\u4e00\u4e2a\u5b57\u7b26\uff0c\u90a3\u4e48\u4e0d\u53cd\u8f6c\u3002
return reverseString(s.substring(1))+s.charAt(0);} //\u5173\u952e\u5c31\u5728\u8fd9\u91cc\u4e86\uff0c
\u4e0b\u9762\u8bf4\u8bf4\u8fd9\u4e2a
\u8fd9\u4e2a reverseString(s.substring(1)) +s.charAt(0); \u7684\u610f\u601d\u662f\u628a\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4f4d\u632a\u5230\u6700\u540e\u3002\u914d\u5408
reverseString(s.substring(1))\u9012\u5f52\u8c03\u7528\uff0c\u6bcf\u6b21\u90fd\u628a\u5b57\u7b26\u4e32\u7684\u7b2c\u4e00\u4f4d\u632a\u5230\u6700\u540e\u3002\u76f4\u5230\u9012\u5f52\u7684\u53c2\u6570\u53ea\u5269\u4e0b\u4e00\u4e2a\u5b57\u7b26\u4e3a\u6b62\u3002
数组下标 越界 这个是用数组常有错误！
代码：
import java.util.*;
public class Practise {
public static void main(String[] args) {
System.out.println("输入字符串: ");
Scanner S = new Scanner(System.in);
String b = S.nextLine();
char[] ch = b.toCharArray();
for (int i = ch.length-1;i >=0; i--) {
System.out.print(ch[i]);
}
S.close();
}
}
public class SingleDome{
public static void main(String[] args){
java.util.Scanner sc = new java.util.Scanner(System.in);
System.out.println("请输入字符串...");
String str = sc.next();
StringBuffer sb = new StringBuffer();
sb.append(str);
String fanzhuan = String.valueOf(sb.reverse());
System.out.println(fanzhuan);
}
}
数组的索引是从0开始 的 最大为 length-1 循环一开始数组就越界了
for (int i = ch.length-1; i >= 0; i--){ System.out.print(ch[i]); }
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