如何在Java中实现多行输入

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder input = new StringBuilder();

        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            if (line.isEmpty()) {
                break;
            }
            input.append(line).append("\n");
        }

        // 处理输入
        System.out.println("多行输入为：" + input.toString());
    }
}

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

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder input = new StringBuilder();

        String line;
        while ((line = reader.readLine()) != null && !line.isEmpty()) {
            input.append(line).append("\n");
        }

        // 处理输入
        System.out.println("多行输入为：" + input.toString());
    }
}

import java.io.IOException;

public class Main {
    public static void main(String[] args) throws IOException {
        StringBuilder input = new StringBuilder();

        int c;
        while ((c = System.in.read()) != -1) {
            if (c == '\n') {
                break;
            }
            input.append((char) c);
        }

        // 处理输入
        System.out.println("多行输入为：" + input.toString());
    }
}