무한 루프를 만들었고 루프를 시작할 때마다 취소 버튼이 작동하지 않고 대화 상자가 계속 팝업됩니다. 나는이 권리를 포맷하지 않은 경우취소 버튼 기능을 만드는 방법
여기
String buffer = " "; //Input a string into console
boolean badInput = true;
boolean badInput2 = true;
String idNum = ""; //ask for id number
String skill = ""; // ask for skill number
int skillInt = 0; // skill is an int
//prompt user for file location
File loc = new File(JOptionPane.showInputDialog(null, "Please provide the file location: "));
RandomAccessFile store = new RandomAccessFile(loc, "rw");
//prompt user for a command
String cmd = "start";
int recLocation = 0;
while(cmd.compareToIgnoreCase("end")!=0){ //stay in program (loop) until end command is given
cmd = JOptionPane.showInputDialog(null, "Please input a command (new, old or end): ");
//creating new entry
if(cmd.compareToIgnoreCase("new")==0){
while(badInput){ //keep them in loop until they give the input in the right format
idNum = JOptionPane.showInputDialog(null, "Please input an ID number (1 - 20): ");
// else JOptionPane.CANCEL_OPTIONsetDefaultCloseOperation(JOptionPane.EXIT_ON_CLOSE);
try{
//corresponding int for ID number, which becomes the record location
//if number is not 1-20, code below
recLocation = Integer.parseInt(idNum);
if(recLocation<1 || recLocation>20){
System.out.println("Please check that your number is between 1 and 20.");
}else{
badInput = false;
break;
}
}
catch(NumberFormatException NF){ // if input isnt a number
System.out.println("Please check that your number is in the correct format.");
}
}
//ask for names
String pName = JOptionPane.showInputDialog(null, "Please input a player name: ");
String tName = JOptionPane.showInputDialog(null, "Please input a team name: ");
//ask for skill level
while(badInput2){ //keep them in the loop until they give the input in the right format
skill = JOptionPane.showInputDialog(null, "Please input a skill level (0 - 99): ");
try{
//corresponding int for skill number, to check if in the right format
skillInt = Integer.parseInt(skill);
if(skillInt<0 || skillInt>99){
System.out.println("Please check that your number is between 0 and 99.");
}else{
badInput2 = false;
break;
}
}
catch(NumberFormatException NF){ //exception or error thrown if input is not in correct format
System.out.println("Please check that your number is in the correct format.");
}
}
String date = JOptionPane.showInputDialog(null, "Please input today's date (ex: 25Jun2014): ");
//formatting id number
if (idNum.length() < 2){
idNum = idNum+buffer;
}
//formatting player name
if (pName.length() > 26){
pName = pName.substring(0, 26);
} else {
while(pName.length() < 26){
pName = pName+buffer;
}
}
//formatting team name
if (tName.length() > 26){
tName = tName.substring(0, 26);
} else {
while(tName.length() < 26){
tName = tName+buffer;
}
}
//formatting date
if (date.length() > 9){
date = date.substring(0, 9);
} else {
while(date.length() < 9){
date = date+buffer;
}
}
//formatting skill
if (skill.length() < 2){
skill = skill+buffer;
}
//create full, identifying string
String fullRecord = idNum + " " + pName + tName + skill + " " + date;
store.seek((RECORD_LENGTH+2) * (recLocation-1));
store.writeUTF(fullRecord);
//reset booleans
badInput = true;
badInput2 = true;
}
//accessing old entry
if(cmd.compareToIgnoreCase("old")==0){
idNum = JOptionPane.showInputDialog(null, "Please input an ID number (1 through 20): ");
recLocation = Integer.parseInt(idNum);
store.seek((RECORD_LENGTH+2)*(recLocation-1));
String fullRecord = store.readUTF();
//interpret information from full string
try
{idNum = fullRecord.substring(0, 5);
String pName = fullRecord.substring(5, 31);
String tName = fullRecord.substring(31, 57);
skill = fullRecord.substring(57, 62);
String date = fullRecord.substring(62, 71);
System.out.println("ID: "+idNum+" NAME: "+pName+" TEAM: "+tName+" SKILL: "+skill+" DATE: "+date);
}
catch(StringIndexOutOfBoundsException S){
System.out.println("No record found at that location.");
}
}
// JOptionPane.showMessageDialog(null, "good bye");
}
죄송 코드를합니다. 내 첫 시간이야. 루프를 종료하기 위해 취소 버튼을 어떻게 얻을 수 있는지 궁금합니다. 나는 if (cmd == null) System.exit(0);
을 사용하여 시도했지만 작동하지 않는 것 같습니다. 나는 자바에서 정말 초보자 다. 그래서 나에게는 작은 경험이있다. 그런 다음 JOptionPane.showInputDialog 중 하나()의 반환 그들이 당신을 취소했던 의미하는 null의 경우 https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#equalsIgnoreCase(java.lang.String)
while(!cmd.equalsToIgnoreCase("end")) {
:
이 페이지를 참조하십시오 : http://stackoverflow.com/help/mcve. 여기서 핵심은 MINIMAL입니다. 즉, 문제를 재현 할 수있는 최소한의 코드를 생성하십시오. 루프의 중간에있는 모든 것들은 관련이 없으며 질문을 읽기가 어렵게 만듭니다. – nhouser9