如何在switch里面停止循环？

怎么能在case9里面结束循环
不再显示

Please choose from one of the following menu options -

1) Display levels and hourly rates of consultants

2) Display levels and hourly bill rates of consultants

3) Staff project

4) Display project staffing proposal

5) Calculate profit

9) Submit project staffing proposal and exit option:

让结果显示如下：

这是我现在的代码

public static int displayMenu() {
Scanner input = new Scanner(System.in);

    while (true) {
        System.out.println();
        System.out.println("Please choose from one of the following menu options -");
        System.out.println("1) Display levels and hourly rates of consultants");
        System.out.println("2) Display levels and hourly bill rates of consultants");
        System.out.println("3) Staff project");
        System.out.println("4) Display project staffing proposal");
        System.out.println("5) Calculate profit");
        System.out.println("9) Submit project staffing proposal and exit");
        System.out.println("option:");
        int option = input.nextInt();
        switch (option) {
  case 9:
            System.out.println("You have successfully submitted your project proposal. Good-bye! ");
            break;

boolean loop = true;

while(loop)

case 9:
    loop = false;
    break;

两个办法：
（1）使用额外的bool变量

public static int displayMenu() {
Scanner input = new Scanner(System.in);

        Boolean isbreak = false;
    while (isbreak) {
        isbreak = false;
        System.out.println();
        System.out.println("Please choose from one of the following menu options -");
        System.out.println("1) Display levels and hourly rates of consultants");
        System.out.println("2) Display levels and hourly bill rates of consultants");
        System.out.println("3) Staff project");
        System.out.println("4) Display project staffing proposal");
        System.out.println("5) Calculate profit");
        System.out.println("9) Submit project staffing proposal and exit");
        System.out.println("option:");
        int option = input.nextInt();
        switch (option) {
  case 9:
            System.out.println("You have successfully submitted your project proposal. Good-bye! ");
                        isbreak = true;
            break;
}
if (isbreak) break;
}
（2）使用goto语句

public static int displayMenu() {
Scanner input = new Scanner(System.in);


    while (true) {
        System.out.println();
        System.out.println("Please choose from one of the following menu options -");
        System.out.println("1) Display levels and hourly rates of consultants");
        System.out.println("2) Display levels and hourly bill rates of consultants");
        System.out.println("3) Staff project");
        System.out.println("4) Display project staffing proposal");
        System.out.println("5) Calculate profit");
        System.out.println("9) Submit project staffing proposal and exit");
        System.out.println("option:");
        int option = input.nextInt();
        switch (option) {
  case 9:
            System.out.println("You have successfully submitted your project proposal. Good-bye! ");
                        goto end;
            break;
}

}
end:
...

switch 分支中如要结束方法，直接 return ，不需要 break 语句。
break 是结束 switch 的。

java没有goto语句，使用标签来跳出嵌套循环

标准写法

        end:
        while (true) {
            //...嵌套循环
            break end;//对end标签的循环执行break
        }