Java随意输入字符串，如果含有$将该字符及之前一个字符的去掉

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题意：

在控制台任意输入字符串，如果含有"$"将该字符及它前一个字符去掉，如含有"%",将该字符及前面所有字符串去掉，获得新的字符串打印出来。
例如：输入：abcd$$ef;输出：abef输入:abc%def$$g,输出：dg

根据题意可以知道最简单的办法就是使用递归及其一些判断即可

package file;import java.util.Scanner;public class StringTest {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.println("输入字符串：");String oldLine = scanner.nextLine();System.out.println("得到的新字符串为：" + getPercentString(oldLine));// System.out.println(oldLine.replace("$","")+"你好");}public static String getNewString(String line) {if (line.contains("$")) {String newString;char[] strChar = line.toCharArray();int index = line.indexOf("$");if (strChar[0] == '$') {if (line.length() == 1) {// 将$开头的直接去掉return null;} else {String str = line.substring(1, line.length());return getNewString(str);// 递归}}String str = line.substring(index - 1, index + 1);newString = line.replace(str, "");String getString = getNewString(newString);if (getString.length() < 1) {return "空字符";}return getString;}return line;}public static String getPercentString(String line) {String newLine;if (line.contains("%") && !line.contains("$")) {return getOnlyPercentString(line);} else if (line.contains("%") && line.contains("$")) {int indexPercent = line.indexOf("%");int indexDollar = line.indexOf("$");if(indexPercent>indexDollar){return getOnlyPercentString(line);}else if(indexPercent<indexDollar){newLine = getOnlyPercentString(line);return getNewString(newLine);}}else if(line.contains("$")&&!line.contains("%")){return getNewString(line);}return line;}public static String getOnlyPercentString(String line) {if (line.contains("%")) {String newString;char[] strChar = line.toCharArray();int index = line.indexOf("%");if (strChar[0] == '%') {if (line.length() == 1) {// 将%开头的直接去掉return null;} else {String str = line.substring(index+1, line.length());newString = line.substring(index + 1, line.length());return getOnlyPercentString(newString);// 递归}}else{String str = line.substring(index+1, line.length());newString = line.substring(index + 1, line.length());if(newString.length()<1){return "空字符";}return getOnlyPercentString(newString);// 递归}}return line;}
}