Java 如何在此文件中覆盖
我想覆盖此文件,但无法覆盖。它只储存一次。我想在每次输入数据时存储数据Java 如何在此文件中覆盖,java,file,Java,File,我想覆盖此文件,但无法覆盖。它只储存一次。我想在每次输入数据时存储数据 int i = 0; while (i != 1) { int choice; System.out.println("1-show employee"); System.out.println("2-add employee"); System.out.println("3-remove employee"); System.o
int i = 0;
while (i != 1) {
int choice;
System.out.println("1-show employee");
System.out.println("2-add employee");
System.out.println("3-remove employee");
System.out.println(" Enter Your Choice ");
Scanner s = new Scanner(System.in);
choice = s.nextInt();
switch (choice) {
case 1:
String z = showEmployee();
System.out.println(z);
break;
case 2:
String em;
Scanner v = new Scanner(System.in);
em = v.nextLine();
addEmployee(em);
System.out.println("Employee added");
break;
default:
System.out.println("wrong ");
break;
}
System.out.println("Continue=0");
System.out.println("Exit=1");
i = s.nextInt();
}
}
public static void addEmployee(String n) throws FileNotFoundException, IOException {
DataOutputStream f1 = new DataOutputStream(new FileOutputStream("E:\\test.txt"));
f1.writeUTF(n);
f1.close();
}
public static String showEmployee() throws FileNotFoundException, IOException {
DataInputStream f1 = new DataInputStream(new FileInputStream("E:\\test.txt"));
return f1.readUTF();
}
您可以从文件中获取旧员工的数据,然后在末尾连接新员工
public static void addEmployee(String n) throws FileNotFoundException, IOException {
String oldData = showEmployee();
DataOutputStream f1 = new DataOutputStream(new FileOutputStream("E:\\test.txt"));
f1.writeUTF(oldData + "\n" + n);
f1.close();
}
你的意思是你想追加吗?听起来像是在覆盖…使用带有布尔追加参数的构造函数。在谷歌上搜索“java open file for appending”,我发现: