//指定位置新建文件
File file=new File("d:\\asd.txt");//文件对象
if (file.exists()) {
System.out.println("文件已存在！");
System.exit(0);
}
//写入信息到文件
PrintWriter out = new PrintWriter(file);
out.println("hello!");
out.println("How are you?");
out.println("happy");
out.println("like you!");
out.close(); //关闭写出器
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