将这段代码翻译成python语言 private StringBuilder removeSpace(String s) { // System.out.println("ReverseWords.removeSpace() called with: s = [" + s + "]"); int start = 0; int end = s.length() - 1; while (s.charAt(start) == ' ') start++; while (s.charAt(end) == ' ') end--; StringBuilder sb = new StringBuilder(); while (start <= end) { char c = s.charAt(start); if (c != ' ' || sb.charAt(sb.length() - 1) != ' ') { sb.append(c); } start++; } // System.out.println("ReverseWords.removeSpace returned: sb = [" + sb + "]"); return sb; }

Sure! Here's the equivalent Python code for the given Java code:

def removeSpace(s):
    start = 0
    end = len(s) - 1
    while s[start] == ' ':
        start += 1
    while s[end] == ' ':
        end -= 1
    sb = []
    while start <= end:
        c = s[start]
        if c != ' ' or sb[-1] != ' ':
            sb.append(c)
        start += 1
    return ''.join(sb)

Note that in Python, we use a list (`sb`) instead of a `StringBuilder` to concatenate characters since strings are immutable. Finally, we use the `join` method to convert the list back into a string.

相关问题

Runtime.getRuntime().exec()调用python 并获取python 执行的结果，封装成bean

可以通过Java的ProcessBuilder类来执行Python脚本，并将结果封装成Bean对象。具体步骤如下：

1. 创建一个ProcessBuilder对象，设置要执行的Python命令和参数：

ProcessBuilder pb = new ProcessBuilder("python", "your_python_script.py", "arg1", "arg2");

2. 启动进程并等待其完成：

Process process = pb.start();
int exitCode = process.waitFor();

3. 读取Python脚本的输出：

BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
StringBuilder result = new StringBuilder();
while ((line = reader.readLine()) != null) {
    result.append(line).append("\n");
}

4. 将输出转换为Bean对象：

假设Python脚本的输出为如下JSON格式：

{
  "name": "John",
  "age": 30
}

则可以定义一个对应的Java Bean类：

public class Person {
    private String name;
    private int age;

    // getters and setters
}

然后使用Jackson库将JSON字符串转换为Java对象：

ObjectMapper objectMapper = new ObjectMapper();
Person person = objectMapper.readValue(result.toString(), Person.class);

完整代码如下：

import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class PythonExecutor {
    public static void main(String[] args) throws IOException, InterruptedException {
        ProcessBuilder pb = new ProcessBuilder("python", "your_python_script.py", "arg1", "arg2");
        Process process = pb.start();
        int exitCode = process.waitFor();

        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line;
        StringBuilder result = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            result.append(line).append("\n");
        }

        ObjectMapper objectMapper = new ObjectMapper();
        Person person = objectMapper.readValue(result.toString(), Person.class);

        System.out.println(person.getName());
        System.out.println(person.getAge());
    }
}

AVA实现Python中struct.pack()和struct.unpack()方法

在 Java 中，你可以使用 ByteBuffer 类来实现类似于 Python 中 struct 模块中的 pack 和 unpack 方法的功能。以下是一个示例代码：

import java.nio.ByteOrder;

public class StructExample {
 public static void main(String[] args) {
 // 将 int 值打包为字节序列 int intValue =12345;
 byte[] packedBytes = packInt(intValue);
 System.out.println("Packed bytes: " + bytesToHex(packedBytes));

 // 将字节序列解包为 int 值 int unpackedInt = unpackInt(packedBytes);
 System.out.println("Unpacked int: " + unpackedInt);
 }

 private static byte[] packInt(int value) {
 ByteBuffer buffer = ByteBuffer.allocate(4);
 buffer.order(ByteOrder.LITTLE_ENDIAN); // 设置字节序为小端序列（与Python的struct默认相同）
 buffer.putInt(value);
 return buffer.array();
 }

 private static int unpackInt(byte[] bytes) {
 ByteBuffer buffer = ByteBuffer.wrap(bytes);
 buffer.order(ByteOrder.LITTLE_ENDIAN); // 设置字节序为小端序列 return buffer.getInt();
 }

 private static String bytesToHex(byte[] bytes) {
 StringBuilder sb = new StringBuilder();
 for (byte b : bytes) {
 sb.append(String.format("%02X", b));
 }
 return sb.toString();
 }
}

上述代码演示了 Java 中如何实现类似于 Python 的 struct 模块中的 pack 和 unpack 方法。`packInt` 方法将一个 int 值打包为字节序列，`unpackInt` 方法将字节序列解包为一个 int 值。在这个示例中，我们使用了 ByteBuffer 类来处理字节操作，并通过设置字节序为小端序列来与 Python 的 struct 默认行为保持一致。