java - 如何结束开关内部的开关。 java

Question

我正在尝试在开关内进行开关。我已经编译它了，但唯一的事情是，每次运行它时，我都会为第一个开关选择一个案例，一旦我为开关内部的第一个开关选择一个案例，它就会还要求我为第一个开关内的第二个开关选择一个案例，然后是第三个开关，然后结束。在选择开关内的第一个开关后，如何使整个程序重新从头开始，或者结束程序。谢谢。

例如。

System.out.println("Pick a color.\n");

System.out.println("          1. Red");
System.out.println("          2. Blue");
System.out.println("          3. Yellow");
System.out.println("          4. Green");

Scanner kbReader = new Scanner(System.in);
int color = kbReader.nextInt();

System.out.println("The color you chose was " + color + ".");
String s1 = kbReader.nextLine();

switch (color)
    {
case 1: //Red
System.out.println("Now enter an integer from 1 through 10.");
int num1 = kbReader.nextInt();

switch (num1)
        {
case 1:
case 3:
case 5:
case 7:
case 9:
    System.out.println("");

case 2:
case 4:
case 6:
case 8:
case 10:
    System.out.println("");
    break;
        }
case 2: //Blue
System.out.println("Now enter an integer from 1 through 10.");
int num2 = kbReader.nextInt();

switch (num2)
        {
case 1:
case 3:
case 5:
case 7:
case 9:
    System.out.println("");

case 2:
case 4:
case 6:
case 8:
case 10:
    System.out.println("");

        }
case 3: //Yellow
System.out.println("Now enter an integer from 1 through 10.");
int num3 = kbReader.nextInt();

switch (num3)
        {
case 1:
case 3:
case 5:
case 7:
case 9:
    System.out.println("");

case 2:
case 4:
case 6:
case 8:
case 10:
    System.out.println("");

        }
case 4: //Green
System.out.println("Now enter an integer from 1 through 10.");
int num4 = kbReader.nextInt();

switch (num4)
        {
case 1:
case 3:
case 5:
case 7:
case 9:
    System.out.println("");

case 2:
case 4:
case 6:
case 8:
case 10:
    System.out.println("");     
        }
    }
}

Answer 1

只需在 switch 语句内的 switch 语句后面放置一个 break 即可。

即(例如)

switch (color) 
    { 
case 1: //Red 
System.out.println("Now enter an integer from 1 through 10."); 
int num1 = kbReader.nextInt(); 

switch (num1) 
        { 
case 1: 
case 3: 
case 5: 
case 7: 
case 9: 
    System.out.println(""); 

case 2: 
case 4: 
case 6: 
case 8: 
case 10: 
    System.out.println(""); 
    break; 
        } 

break;  <--- this is the addition
case 2: //Blue 

或者(并且会使整个事情更具可读性)将这些开关放入另一个函数中