[英]Looping program when I try to close it. How do I fix this infinite loop?
This program is supposed to take in input from the user, put it into a text file, and then be able to pull info if needed later on (not yet implemented). 该程序应该从用户处接收输入,将其放入文本文件,然后能够在以后需要时提取信息(尚未实现)。 The program open and take in values and save them, but when I go to close the program, a new window appears, and this repeats. 程序打开并接受值并保存,但是当我关闭程序时,将出现一个新窗口,并重复进行。 Any help on how to stop this? 对如何阻止这种情况有帮助吗? It might just be a break missing somewhere, but I can't fix it for the life of me. 可能只是某个地方的休息而已,但我无法终生解决。
public class FirstTr {
final private static int MAX_RECORD_NUMBER = 71;
final private static int MAX_PLAYER_NUMBER = 99;
final private static char PLAYER_NAME = 26;
final private static char TEAM_NAME = 26;
final private static int SKILL_LEVEL = 5;
final private static int DRAFT_DATE = 9;
final private static int RECORD_LENGTH = 16;
final private static int PLAYER_ID = 20;
final private static int ID_Length = 5;
public static void main(String[] args) throws FileNotFoundException, IOException {
File loc = new File("C:\\Users\\Desktop\\Exc2.1.txt");
RandomAccessFile store = new RandomAccessFile(loc, "rw");
String id1 = "";
String id2 = "";
String id3 = "";
String id4 = "";
String id = "";
String Description = "";
int recLocation = 0;
String cmd = "Start";
String where = "0";
cmd= JOptionPane.showInputDialog(null, " Please type in a command : new, old or exit");
if (cmd.compareToIgnoreCase("end")== 0){
store.close();
System.exit(0);
}
while (cmd.compareToIgnoreCase("end")!= 0){
if (cmd.compareToIgnoreCase("new") == 0){
//Ask user for ID 1-20, read ID
try{
id1 = JOptionPane.showInputDialog(null,"Enter ID(1-20):");
recLocation= Integer.parseInt(id1);
assert Integer.MAX_VALUE == PLAYER_ID;
JOptionPane.showInputDialog(null, "The ID IS "+ id1);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY THIS IS NOT AN INTEGER PLEASE PRESS ENTER TO CONTINUE");
}
try{
//Ask user for player name, read name
id2 = JOptionPane.showInputDialog(null, "Enter a players name");
assert id.length()== PLAYER_NAME;
JOptionPane.showInputDialog("The players name is " + id2 + " press enter to continue");
store.writeUTF(id2);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY SOMETHING WENT WRONG PLEASE PRESS ENTER TO CONTINUE");
}
try{
//ask for player team name, read team name
id3 = JOptionPane.showInputDialog(null, "Enter a players team name");
JOptionPane.showInputDialog("The players team name is " + id3 + ", press enter to continue");
assert id.length()== TEAM_NAME;
store.writeUTF(id3);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SOMETHING WENT WRONG PLEASE PRESS ENTER TO CONTINUE");
}
//enter player skill level, read skill level(0-99)
try{
id4 = JOptionPane.showInputDialog(null,"Enter a players skill level (0-99)");
recLocation = Integer.parseInt(id4);
JOptionPane.showInputDialog("The players skill level " + id4 + " press enter to continue");
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY THIS IS NOT AN INTEGER PLEASE PRESS ENTER TO CONTINUE");
}
//enter player skill level, read skill level
try{
id = JOptionPane.showInputDialog(null, "Enter todays Date");
JOptionPane.showInputDialog("Today is " + id + " press enter to continue");
assert id.length()== DRAFT_DATE;
store.writeUTF(id);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY THIS IS NOT AN INTEGER PLEASE PRESS ENTER TO CONTINUE");
continue;
}
//convert ID and skill level to string(char-5)
}
//if command is old, ask for ID and read Id, then use ID to retrieve record, display the record formatted for readability
if (cmd.compareToIgnoreCase("old") == 0) {
try{
where = JOptionPane.showInputDialog(null, "Enter player:");
recLocation = Integer.parseInt(where);
store.seek((PLAYER_ID) * (recLocation-1));
Description = store.readUTF();
JOptionPane.showMessageDialog(null, Description);
}
catch(Exception e){
JOptionPane.showInputDialog("Sorry there is no player try again");
continue;
}
}
}
}
You are only reading input for cmd
one time, and then it is never re-assigned. 您只读取一次cmd
输入,然后再也不会重新分配它。 So, that first while
loop is going to loop forever if its condition ( cmd.compareToIgnoreCase("end")!= 0
) is true in the first place. 因此,如果第一个while
循环的条件( cmd.compareToIgnoreCase("end")!= 0
)首先为true,则它将永远循环。
Your while loop
is the culprit. 您的while loop
是罪魁祸首。 The loop literally keeps going because there is nothing that is changing the condition. 循环实际上一直在进行,因为没有任何东西可以改变条件。
if you were to make a way to change this condition (cmd.compareToIgnoreCase("end")!= 0)
to true somewhere within your script, your script will terminate the way you wanted it to! 如果您想办法将此条件(cmd.compareToIgnoreCase("end")!= 0)
更改为true,那么脚本将终止您希望的方式!
NOTE: you are not assigning the word "exit"
to a command! 注意:您没有将单词"exit"
分配给命令! Maybe making a command for that will make the script do what you want! 也许为此执行命令将使脚本执行您想要的操作!
EDIT: Try changing "end"
to "exit"
within these snippets here! 编辑:尝试在这些摘要中将"end"
更改为"exit"
!
if (cmd.compareToIgnoreCase("end")== 0){
store.close();
System.exit(0);
while (cmd.compareToIgnoreCase("end")!= 0)
EDIT2 : By adding the above if statement to the bottom of your while loop, it should exit! EDIT2 :通过将以上if语句添加到while循环的底部,它应该退出!
while (cmd.compareToIgnoreCase("exit")!= 0){
if (cmd.compareToIgnoreCase("new") == 0){
//Ask user for ID 1-20, read ID
try{
id1 = JOptionPane.showInputDialog(null,"Enter ID(1-20):");
recLocation= Integer.parseInt(id1);
assert Integer.MAX_VALUE == PLAYER_ID;
JOptionPane.showInputDialog(null, "The ID IS "+ id1);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY THIS IS NOT AN INTEGER PLEASE PRESS ENTER TO CONTINUE");
}
try{
//Ask user for player name, read name
id2 = JOptionPane.showInputDialog(null, "Enter a players name");
assert id.length()== PLAYER_NAME;
JOptionPane.showInputDialog("The players name is " + id2 + " press enter to continue");
store.writeUTF(id2);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY SOMETHING WENT WRONG PLEASE PRESS ENTER TO CONTINUE");
}
try{
//ask for player team name, read team name
id3 = JOptionPane.showInputDialog(null, "Enter a players team name");
JOptionPane.showInputDialog("The players team name is " + id3 + ", press enter to continue");
assert id.length()== TEAM_NAME;
store.writeUTF(id3);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SOMETHING WENT WRONG PLEASE PRESS ENTER TO CONTINUE");
}
//enter player skill level, read skill level(0-99)
try{
id4 = JOptionPane.showInputDialog(null,"Enter a players skill level (0-99)");
recLocation = Integer.parseInt(id4);
JOptionPane.showInputDialog("The players skill level " + id4 + " press enter to continue");
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY THIS IS NOT AN INTEGER PLEASE PRESS ENTER TO CONTINUE");
}
//enter player skill level, read skill level
try{
id = JOptionPane.showInputDialog(null, "Enter todays Date");
JOptionPane.showInputDialog("Today is " + id + " press enter to continue");
assert id.length()== DRAFT_DATE;
store.writeUTF(id);
}
catch (Exception e){
JOptionPane.showInputDialog(null, "SORRY THIS IS NOT AN INTEGER PLEASE PRESS ENTER TO CONTINUE");
continue;
}
//convert ID and skill level to string(char-5)
}
//if command is old, ask for ID and read Id, then use ID to retrieve record, display the record formatted for readability
if (cmd.compareToIgnoreCase("old") == 0) {
try{
where = JOptionPane.showInputDialog(null, "Enter player:");
recLocation = Integer.parseInt(where);
store.seek((PLAYER_ID) * (recLocation-1));
Description = store.readUTF();
JOptionPane.showMessageDialog(null, Description);
}
catch(Exception e){
JOptionPane.showInputDialog("Sorry there is no player try again");
continue;
}
if (cmd.compareToIgnoreCase("exit")== 0){
store.close();
System.exit(0);
}
}
}
}
Hope this helps! 希望这可以帮助!
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