Java实现字符串倒序输出的四种方法汇总

/*
	 * string倒序输出 
	 * 利用String类的toCharArray()，再倒序输出数组的方法
	 * 2018-5-18 13:05:00
	 */
	private static void reverseString1(String str) {
		char[] chr = str.toCharArray();
		for (int i = chr.length-1 ; i >= 0; i--) {
			System.out.print(chr[i]);
		}
		System.out.println("\t");
	}
	/*
	 * string倒序输出 
	 * 利用String类提供的subString()方法，利用递归的办法输出倒序字符串。
	 * 2018-5-18 13:16:00
	 */
	private static void reverseString2(String str) {
		if (str.length() == 1)
			System.out.println(str);
		else {
			String subString1 = str.substring(0, str.length() - 1);
			String subString2 = str.substring(str.length() - 1);
			System.out.print(subString2);
			reverseString2(subString1);
		}
	}
	/*
	 * string倒序输出 
	 * 定义成一个StringBuffer类，用StringBuffer类中的reverse()方法直接倒序字符串。
	 * 2018-5-18 13:22:10
	 */
	private static void reverseString3(String str) {
		StringBuffer buffer = new StringBuffer(str);
		System.out.println(buffer.reverse());
	}
	/*
	 *  自己瞎写
	 *  还是利用subString()方法，只不过循环输出
	 *  2018-5-18 13:18:30
	 */
	private static void reverseStringMy(String str) {
		StringBuffer a = new StringBuffer();
		String subString2 = "";
		for (int i = str.length(); i > 0; i--) {
			subString2 = str.substring(i - 1, i);
			a.append(subString2);
		}
		System.out.print("My:" + a);
		System.out.println("\t");
	}

public static void main(String[] args) {
	        String str1 = "abc";
		System.out.println(str1.substring(2));
		String str = "holle world";
		//倒序输出的4种方式
		reverseString1(str);
		reverseString2(str);
		reverseString3(str);
		reverseStringMy(str);
	}

package shenjin;
import java.util.Scanner;
/**
 * 输入一句英文，将英文句子反转
 * 
 * @author LENOVO
 *
 */
public class ReverseEnglish {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String str = scanner.nextLine();
		String[] reverse = str.split(" ");
		for (int i = reverse.length - 1; i >= 0; i--) {
			System.out.print(reverse[i] + " ");
		}
	}
}

package shenjin;
import java.util.Scanner;
/**
 * 输入一句英文，将英文句子反转，并将最后英文标点放到首位
 * @author LENOVO
 *
 */
public class ReverseEnglish2 {
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		String str = scanner.nextLine();
		String str1 = str.substring(0, str.length()-1);
		String str2 = str.substring(str.length()-1, str.length());
		String[] reverse = str1.split(" ");
		System.out.print(str2);
		for (int i = reverse.length - 1; i >= 0; i--) {
			System.out.print(reverse[i] + " ");
		}
	}
}