如何在java中的while循环中设置switch语句

我想在while循环中进行切换，在每个switch语句中断while循环停止并请求输入如F，R，C，Q。下面的语句有效，但语句不会中断。 请帮忙

public static void main(String[] args) throws IOException { // start both with 1 point int goodTotal = 50; int monTotal = 50; // input switch statement while (goodTotal > 0 && monTotal > 0) { System.out.print("Type a letter: "); System.out.println("\n"); System.out.print("F: Go out and Fight "); System.out.println("\n"); System.out.print("R: Rest "); System.out.println("\n"); System.out.print("C: Check Stats "); System.out.println("\n"); System.out.print("Q: Quit "); int input = System.in.read(); System.out.println("You typed: " + (char) input); switch (input) { case 'f': System.out.println("Continue the game"); break; case 'r': System.out.println("Players should rest"); break; case 'c': System.out.println("Checking the status of the game"); System.out.print("Goodman has " + goodTotal + " points and Monster has " + monTotal + " points"); System.out.println("\n"); break; case 'q': System.out.println("Game over"); System.exit(input); break; default: System.out.println("Invalid selection"); break; } // Set value of minimum and maximum damage int minDmg = 2; int maxDmg = 15; // Get random number; int damage = minDmg + Double.valueOf(Math.random() * (maxDmg - minDmg)).intValue(); int damage2 = minDmg + Double.valueOf(Math.random() * (maxDmg - minDmg)).intValue(); // remove value of damage from started value to get total value remaining goodTotal = goodTotal - damage; monTotal = monTotal - damage2; // print message if still in the game if (goodTotal > 0) { System.out.println("Goodman has " + goodTotal + " points left. Not bad, Man! "); } // if Goodman survives round 2 print a message of encouragement if (goodTotal > 0 && count > 1 && count  0 && count == 3) { System.out.print("Goodman is as strong as Samson. He has lasted round " + count + " and still looks strong."); System.out.print(" 10 hit points has been added to your total"); } if (monTotal > 0) { System.out.println("Wait, Monster has a total of " + monTotal + " points and is still in the game"); } // exit if have less than 0 point, and print game over. Congratulate the winner if (goodTotal < 0) { System.out.println("Goodman you are out of the game"); System.out.println("The monster will take over the village. This is sad"); System.out.println("Game Over!"); } else if (monTotal < 0) { System.out.println("Goodman has been victorious"); System.out.println("The monster is dead. The people live!!!!"); System.out.println("Game Over!"); } System.out.println("This is the end of round " + count + " "); System.out.println("\n"); count = count + 1; } } 

Answer 1

在循环上使用标签：

 loop: while (goodTotal > 0 && monTotal > 0) { // ... switch (input) { case 'f': // ... break loop; case 'r': // ... break loop; // ... } // ... } 

Answer 2

你应该使用带标签的break 。

尽管以不需要它们的方式重写代码可能更好，因为它们不是很容易阅读。

Answer 3

input的类型为int ，但case标签是字符文字 （即f,r,c,q ）。 你为什么不把input也变成char类？

 char input = System.in.read();