编写java应用程序，输入多行字符串，用文件流的方法写入文件jabc.tmp中，并从文件中读取数据

好的，以下是Java代码示例：

import java.io.*;

public class FileIOExample {
    public static void main(String[] args) {
        // 输入多行字符串
        String[] lines = {"Hello World!", "This is line 2.", "And this is line 3."};
        
        // 写入文件
        String filename = "jabc.tmp";
        try {
            FileWriter writer = new FileWriter(filename);
            for (String line : lines) {
                writer.write(line + "\n");
            }
            writer.close();
            System.out.println("文件写入成功！");
        } catch (IOException e) {
            System.out.println("出现异常：" + e.getMessage());
        }
        
        // 从文件中读取数据
        try {
            BufferedReader reader = new BufferedReader(new FileReader(filename));
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
            reader.close();
        } catch (IOException e) {
            System.out.println("出现异常：" + e.getMessage());
        }
    }
}

运行后，程序会输出以下内容：

文件写入成功！
Hello World!
This is line 2.
And this is line 3.

其中，文件 `jabc.tmp` 中的内容为：

Hello World!
This is line 2.
And this is line 3.