我正在制作一个必须与cmd一起运行的文本编辑器。用户粘贴要编辑的文本,然后选择要使用的文本。我很难替换掉他们粘贴的文本的一部分。
这是我为编辑器编写的代码的一部分:
import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class TextEd {
public static void main(String[] args) {
Editor editor = new Editor();
editor.copiedText();
}
}
class Editor {
private Scanner scan = new Scanner(System.in);
private String text = " ";
public void copiedText() {
System.out.println("Paste your text here."); //The user input
text = scan.nextLine();
menu();
}
public void menu() {
System.out.println("Welcome to the text editor.\n"
+ "What do you wish to do?\n"
+ "1. Replace a word/line.\n"
+ "2. Exit program.");
int choice = scan.nextInt();
if (choice == 1) {
replacing();
}
else if (choice == 2) {
System.exit(0);
}
}
}
这是替换部分的代码,我在这里苦苦挣扎:
public void replacing() { //still not working argh
String replacement = scan.nextLine();
System.out.println("What dou you want to replace?");
try {
Pattern replacepat = Pattern.compile(scan.next());
Matcher match = replacepat.match(text);
System.out.println("What dou you want to replace it with?");
scan.nextLine();
boolean found = false;
while (match.find()) {
text = text.replaceAll(replacepat, replacement);
System.out.println(text);
}
}
catch (Exception e) {
System.out.println("There's been an error.");
}
}
我得到的错误通知我,模式无法转换为字符串-我理解,replaceAll与int一起工作-但我不知道如何获取用户要替换的文本的索引,因为用户的工作是先粘贴文本,然后粘贴要替换的文本的另一部分。
答案 0 :(得分:1)
replaceAll将第一个参数编译为正则表达式(请参见javadoc) 因此,您只需提供正则表达式作为字符串即可:
public void replacing() { //still not working argh
System.out.println("What dou you want to replace?");
try {
String findText=scan.next();
System.out.println("What dou you want to replace it with?");
String newText=scan.next();
text = text.replaceAll(findText, newText);
System.out.println(text);
}
catch (Exception e) {
System.out.println("There's been an error.");
}
}
来自javadoc:
An invocation of this method of the form str.replaceAll(regex, repl) yields
exactly the same result as the expression
java.util.regex.Pattern.compile(regex).matcher(str).replaceAll(repl)