Java实例说明 字符串的反转实现方法多种

实例:

反转:String类中没有提供,不过可以自己写一个
public class Hello {
	public static void main(String[] args) {
		Hello  hello = new Hello();
		String string  = "h ello world!";
		System.out.println(string);
		String fString =  hello.reverse(string);
		System.out.println(fString);
		String fString2 =  hello.reverse(fString);
		System.out.println(fString2);
	}

	public String reverse(String s) {
		char ch[] = s.toCharArray();
		int start = 0, end = ch.length - 1;
		char temp;
		while (start < end) {
			temp = ch[start];
			ch[start] = ch[end];
			ch[end] = temp;
			start++;
			end--;
		}
		String s1 = String.copyValueOf(ch);
		return s1;
	}
}
 
  
运行结果:
h ello world!
!dlrow olle h
h ello world!
 
  
 
  
StringBuffer类有这个方法:reverse()
public class Hello {
	public static void main(String[] args) {
		String string  = "h ello world!";
		System.out.println(string);
		String fString =  new StringBuffer(string).reverse().toString();
		System.out.println(fString);
		String fString2 =  new StringBuffer(fString).reverse().toString();
		System.out.println(fString2);
	}
}
 
  
运行结果:
h ello world!
!dlrow olle h
h ello world!

StringBuilder类也有这个方法:reverse()
public class Hello {
	public static void main(String[] args) {
		String string  = "h ello world!";
		System.out.println(string);
		String fString =  new StringBuilder(string).reverse().toString();
		System.out.println(fString);
		String fString2 =  new StringBuilder(fString).reverse().toString();
		System.out.println(fString2);
	}

}

运行结果:
h ello world!
!dlrow olle h
h ello world!

递归方法实现字符串反转


public class Hello {
public static void main(String[] args) {
Hello aHello = new Hello();
String string  = "h ello world!";
System.out.println(string);
String fString =  aHello.reverseString(string);
System.out.println(fString);
}

    //反转字符串
    public static String reverseString(String s){
        if(s.isEmpty()) return s;
        return reverseString(s.substring(1))+s.charAt(0);
    }



}


 
  
运行结果:
h ello world!
!dlrow olle h
h ello world!

你可能感兴趣的:(Java实例说明)