Question

我的字符串是：

"EEE
EEE
AAA
BBB
CCC
BBB
DDD
CCC"

但我需要没有相同的行这个字符串。像这样：

"EEE
AAA
BBB
CCC
DDD"

我该怎么做？

Answer 1

考虑到您将字符串存储在String s中，

怎么样？

String[] tokens = s.split("\n");
StringBuilder resultBuilder = new StringBuilder();
Set<String> alreadyPresent = new HashSet<String>();

boolean first = true;
for(String token : tokens) {

    if(!alreadyPresent.contains(token)) {
        if(first) first = false;
        else resultBuilder.append("\n");

        if(!alreadyPresent.contains(token))
            resultBuilder.append(token);
    }

    alreadyPresent.add(token);
}
String result = resultBuilder.toString();

或：

Set<String> tokens = new HashSet<String>(Arrays.asList(s.split("\n")));
StringBuilder resultBuilder = new StringBuilder();

boolean first = true;
for(String token : tokens) {
    if(first) first = false;
    else resultBuilder.append("\n")

    resultBuilder.append(token);
}

String result = resultBuilder.toString();

Answer 2

这是一个简单的答案

StringBuilder builder = new StringBuilder(); 
for (String line: new LinkedHashSet<String>(Arrays.asList(inputString.split("\n"))) ) {
    builder.append(line);
}
String result = builder.toString();

Answer 3

合适的方法是使用一套。这将允许您过滤字符串集合并排除重复的值。例如：

import java.util.*;

class Sorter
{
    public static void main(String[] args)
    {
        // The input string, this example uses groups of comma separated values
        String input = "EEE,EEE,AAA,BBB,CCC,BBB,DDD,CCC";

        // Create a new set, this will be used for filtering
        Set<String> set = new HashSet<String>();

        // Add each string within input, add to set.
        // Repeated values will be
        for (String s: input.split(","))set.add(s);

        // Format results
        for (String s: set) System.out.println(s);
    }
}

Answer 4

使用Scanner（如StringBuffer）和LinkedHashset搜索重复行。

    String text = "Eds\r\nIsa\r\nEds\nIsa\r\nEds\nIsa";
    StringBuilder textResult = new StringBuilder();
    Set list = new LinkedHashSet<String>();
    Scanner scanner = new Scanner(text);
    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        if(!list.contains(line)){
            list.add(line);
            textResult.append(line).append(System.getProperty("line.separator"));
        }
    }
    scanner.close();
    System.out.println(textResult);

从Java中的String中删除重复的行

4 个答案: