Java 程序卡在用户输入循环中
Java program stuck in user input loop
我正在创建一个小的 'game' 程序，玩家可以在其中输入 floor/room 数字，但是当玩家猜测时它会卡住并在单个玩家上循环并且不会移动到下一位玩家，并且不判断玩家是否正确猜测狗被关在建筑物中的位置。
PuppyPlay.java:
import java.util.Random;
import java.util.Scanner;
/**
* This program is used as a driver program to play the game from the
* class LostPuppy.
*
* A puppy is lost in a multi-floor building represented in the class
* LostPuppy.class. Two players will take turns searching the building
* by selecting a floor and a room where the puppy might be.
*
*/
public class PuppyPlay{
/**
* Driver program to play LostPuppy.
*
* @param theArgs may contain file names in an array of type String
*/
public static void main(String[] theArgs){
Scanner s = new Scanner(System.in);
LostPuppy game;
int totalFloors;
int totalRooms;
int floor;
int room;
char[] players = {'1', '2'};
int playerIndex;
boolean found = false;
Random rand = new Random();
do {
System.out.print("To find the puppy, we need to know:\n"
+ "\tHow many floors are in the building\n"
+ "\tHow many rooms are on the floors\n\n"
+ " Please enter the number of floors: ");
totalFloors = s.nextInt();
System.out.print("Please enter the number of rooms on the floors: ");
totalRooms = s.nextInt();
s.nextLine(); // Consume previous newline character
// Start the game: Create a LostPuppy object:
game = new LostPuppy(totalFloors, totalRooms);
// Pick starting player
playerIndex = rand.nextInt(2);
System.out.println("\nFloor and room numbers start at zero '0'");
do {
do {
System.out.println("\nPlayer " + players[playerIndex]
+ ", enter floor and room to search separated by a space: ");
floor = s.nextInt();
room = s.nextInt();
//for testing, use random generation of floor and room
//floor = rand.nextInt(totalFloors);
//room = rand.nextInt(totalRooms);
} while (!game.indicesOK(floor, room)
|| game.roomSearchedAlready(floor, room));
found = game.searchRoom(floor, room, players[playerIndex]);
playerIndex = (playerIndex + 1) % 2;
System.out.println("\n[" + floor + "], [" + room + "]");
System.out.println(game.toString());
s.nextLine();
} while (!found);
playerIndex = (playerIndex + 1) % 2;
System.out.println("Great job player " + players[playerIndex] +"!");
System.out.println("Would you like to find another puppy [Y/N]? ");
} while (s.nextLine().equalsIgnoreCase("Y"));
}
}
LostPuppy.java:
import java.util.Random; // Randomize the dog placement in building
import java.util.Scanner; // User input
/**
* This program is used as a program to play the game from the
* driver PuppyPlay.java
*
* A puppy is lost in a multi-floor building represented in the class
* LostPuppy.class. Two players will take turns searching the building
* by selecting a floor and a room where the puppy might be.
*
*/
public class LostPuppy{
private char[][] myHidingPlaces; // Defining class fields for assignment
private int myFloorLocation;
private int myRoomLocation;
private char myWinner;
private boolean myFound;
/**
* Creates constructor takes floor/room numbers inputted by user
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public LostPuppy(int theFloors, int theRooms) {
Random random = new Random();
myHidingPlaces = new char[theFloors][theRooms];
// Filling array with spaces
int i;
for (i = 0; i < theFloors; i++) {
for (int k = 0; k < theRooms; k++) {
myHidingPlaces[i][k] = ' ';
}
}
myFloorLocation = random.nextInt(theFloors);
myRoomLocation = random.nextInt(theRooms);
myHidingPlaces[myFloorLocation][myRoomLocation] = 'P';
myWinner = ' ';
myFound = false;
}
/**
* Checks if room has been searched prior
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public boolean roomSearchedAlready(int theFloors, int theRooms) {
boolean searchedRoom;
if (myHidingPlaces[theFloors][theRooms] == ' ') {
myHidingPlaces[theFloors][theRooms] = 'S';
searchedRoom = false;
} else {
searchedRoom = true;
}
return searchedRoom;
}
/**
* Checks if the puppy has been found
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public boolean puppyLocation(int theFloors, int theRooms) {
if (myHidingPlaces[myFloorLocation][myRoomLocation] == myHidingPlaces[theFloors][theRooms]) {
myFound = true;
} else {
myFound = false;
}
return myFound;
}
/**
* Checks if floors and rooms won't throw out of bounds error
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public boolean indicesOK(int theFloors, int theRooms) {
boolean indicesFit;
if (theFloors < numberOfFloors() && theRooms < numberOfRooms()) {
indicesFit = true;
} else {
indicesFit = false;
}
return indicesFit;
}
/*
* Checks # of floors and returns it
*/
public int numberOfFloors() {
return myHidingPlaces.length;
}
/*
* Checks # of rooms and returns it
*/
public int numberOfRooms() {
return myHidingPlaces[0].length;
}
/**
* Checks which player found the dog and won, or if not checks to see what player
* guessed wrong and puts their # in the box
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
* @param thePlayer for 1st or 2nd player
*/
public boolean searchRoom(int theFloors, int theRooms, char thePlayer) {
if (myHidingPlaces[myFloorLocation][myRoomLocation] == myHidingPlaces[theFloors][theRooms]) {
myFound = true;
myWinner = thePlayer;
} else {
myHidingPlaces[theFloors][theRooms] = thePlayer;
myFound = false;
}
return myFound;
}
/*
* toString displays the current hidingPlaces array and it’s contents EXCEPT
* the location of the puppy which remains hidden until he/she is found at
* which point toString will be called (by the driver) and both the player
* who found the puppy and a ‘P’ will be displayed in the same cell….
*
*
*
*/
public String toString() {
return null;
}
}
对于 运行 此代码，您需要将两个代码及其各自的发布名称和 运行 PuppyPlay.java 与 LostPuppy.java 放在同一文件夹中，仅供参考。
问题出在PuppyPlay这个地方：
found = game.searchRoom(floor, room, players[playerIndex]);
playerIndex = (playerIndex + 1) % 2;
System.out.println("\n[" + floor + "], [" + room + "]");
System.out.println(game.toString());
s.nextLine();
所以你的程序希望你在这里输入一些东西，它会一直等到你按下回车键，所以你可以删除那一行：s.nextLine();
我正在创建一个小的 'game' 程序，玩家可以在其中输入 floor/room 数字，但是当玩家猜测时它会卡住并在单个玩家上循环并且不会移动到下一位玩家，并且不判断玩家是否正确猜测狗被关在建筑物中的位置。
PuppyPlay.java:
import java.util.Random;
import java.util.Scanner;
/**
* This program is used as a driver program to play the game from the
* class LostPuppy.
*
* A puppy is lost in a multi-floor building represented in the class
* LostPuppy.class. Two players will take turns searching the building
* by selecting a floor and a room where the puppy might be.
*
*/
public class PuppyPlay{
/**
* Driver program to play LostPuppy.
*
* @param theArgs may contain file names in an array of type String
*/
public static void main(String[] theArgs){
Scanner s = new Scanner(System.in);
LostPuppy game;
int totalFloors;
int totalRooms;
int floor;
int room;
char[] players = {'1', '2'};
int playerIndex;
boolean found = false;
Random rand = new Random();
do {
System.out.print("To find the puppy, we need to know:\n"
+ "\tHow many floors are in the building\n"
+ "\tHow many rooms are on the floors\n\n"
+ " Please enter the number of floors: ");
totalFloors = s.nextInt();
System.out.print("Please enter the number of rooms on the floors: ");
totalRooms = s.nextInt();
s.nextLine(); // Consume previous newline character
// Start the game: Create a LostPuppy object:
game = new LostPuppy(totalFloors, totalRooms);
// Pick starting player
playerIndex = rand.nextInt(2);
System.out.println("\nFloor and room numbers start at zero '0'");
do {
do {
System.out.println("\nPlayer " + players[playerIndex]
+ ", enter floor and room to search separated by a space: ");
floor = s.nextInt();
room = s.nextInt();
//for testing, use random generation of floor and room
//floor = rand.nextInt(totalFloors);
//room = rand.nextInt(totalRooms);
} while (!game.indicesOK(floor, room)
|| game.roomSearchedAlready(floor, room));
found = game.searchRoom(floor, room, players[playerIndex]);
playerIndex = (playerIndex + 1) % 2;
System.out.println("\n[" + floor + "], [" + room + "]");
System.out.println(game.toString());
s.nextLine();
} while (!found);
playerIndex = (playerIndex + 1) % 2;
System.out.println("Great job player " + players[playerIndex] +"!");
System.out.println("Would you like to find another puppy [Y/N]? ");
} while (s.nextLine().equalsIgnoreCase("Y"));
}
}
LostPuppy.java:
import java.util.Random; // Randomize the dog placement in building
import java.util.Scanner; // User input
/**
* This program is used as a program to play the game from the
* driver PuppyPlay.java
*
* A puppy is lost in a multi-floor building represented in the class
* LostPuppy.class. Two players will take turns searching the building
* by selecting a floor and a room where the puppy might be.
*
*/
public class LostPuppy{
private char[][] myHidingPlaces; // Defining class fields for assignment
private int myFloorLocation;
private int myRoomLocation;
private char myWinner;
private boolean myFound;
/**
* Creates constructor takes floor/room numbers inputted by user
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public LostPuppy(int theFloors, int theRooms) {
Random random = new Random();
myHidingPlaces = new char[theFloors][theRooms];
// Filling array with spaces
int i;
for (i = 0; i < theFloors; i++) {
for (int k = 0; k < theRooms; k++) {
myHidingPlaces[i][k] = ' ';
}
}
myFloorLocation = random.nextInt(theFloors);
myRoomLocation = random.nextInt(theRooms);
myHidingPlaces[myFloorLocation][myRoomLocation] = 'P';
myWinner = ' ';
myFound = false;
}
/**
* Checks if room has been searched prior
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public boolean roomSearchedAlready(int theFloors, int theRooms) {
boolean searchedRoom;
if (myHidingPlaces[theFloors][theRooms] == ' ') {
myHidingPlaces[theFloors][theRooms] = 'S';
searchedRoom = false;
} else {
searchedRoom = true;
}
return searchedRoom;
}
/**
* Checks if the puppy has been found
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public boolean puppyLocation(int theFloors, int theRooms) {
if (myHidingPlaces[myFloorLocation][myRoomLocation] == myHidingPlaces[theFloors][theRooms]) {
myFound = true;
} else {
myFound = false;
}
return myFound;
}
/**
* Checks if floors and rooms won't throw out of bounds error
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
*/
public boolean indicesOK(int theFloors, int theRooms) {
boolean indicesFit;
if (theFloors < numberOfFloors() && theRooms < numberOfRooms()) {
indicesFit = true;
} else {
indicesFit = false;
}
return indicesFit;
}
/*
* Checks # of floors and returns it
*/
public int numberOfFloors() {
return myHidingPlaces.length;
}
/*
* Checks # of rooms and returns it
*/
public int numberOfRooms() {
return myHidingPlaces[0].length;
}
/**
* Checks which player found the dog and won, or if not checks to see what player
* guessed wrong and puts their # in the box
*
* @param theFloors for number of floors
* @param theRooms for number of rooms
* @param thePlayer for 1st or 2nd player
*/
public boolean searchRoom(int theFloors, int theRooms, char thePlayer) {
if (myHidingPlaces[myFloorLocation][myRoomLocation] == myHidingPlaces[theFloors][theRooms]) {
myFound = true;
myWinner = thePlayer;
} else {
myHidingPlaces[theFloors][theRooms] = thePlayer;
myFound = false;
}
return myFound;
}
/*
* toString displays the current hidingPlaces array and it’s contents EXCEPT
* the location of the puppy which remains hidden until he/she is found at
* which point toString will be called (by the driver) and both the player
* who found the puppy and a ‘P’ will be displayed in the same cell….
*
*
*
*/
public String toString() {
return null;
}
}
对于 运行 此代码，您需要将两个代码及其各自的发布名称和 运行 PuppyPlay.java 与 LostPuppy.java 放在同一文件夹中，仅供参考。
问题出在PuppyPlay这个地方：
found = game.searchRoom(floor, room, players[playerIndex]);
playerIndex = (playerIndex + 1) % 2;
System.out.println("\n[" + floor + "], [" + room + "]");
System.out.println(game.toString());
s.nextLine();
所以你的程序希望你在这里输入一些东西，它会一直等到你按下回车键，所以你可以删除那一行：s.nextLine();