Ich versuche, die Ausgabe als Spalten anstelle von dem, was ich gerade bekomme, und sie sind überall. Ich möchte es so etwas wie folgt aussehen:Java-Anzeige-Ausgabe in Spalten/Zeilen
Account "Account1":
0 (1) 16 16,
1 (0) 12 12,
2 (2) 0 0
Ich habe versucht, \ t als Separatoren und printf, aber kann es nicht herausfinden. Entschuldigt, wenn der Code schlecht formatiert ist, bin ich noch ziemlich neu
zu Codierungschätze ich Hilfe oder Tipps
Account.java
import java.util.ArrayList;
public class Account {
private static String name;
private int balance;
int Transactions;
private static ArrayList<String> array = new ArrayList<String>(); // array list
/**
* @param args
*/
public static void main(String[] args) {
// Check to make sure program has been called with correct number of
// command line arguments
if (args.length != 3) {
System.err.println("Error: program should take exactly three command line arguments:");
System.err.println("\t<No. of card holders> <main acct starting bal.> <backup acct. starting bal.>");
System.exit(0);
}
// And then make sure that those args are all integers
try {
int numCards = Integer.parseInt(args[0]);
Account account = new Account("Account1", Integer.parseInt(args[1]));
// Your code to create and manage the threads should go here.
Thread[] threads = new Thread[numCards];
for (int i = 0; i < numCards; i++) {
threads[i] = new Thread(new CardHolder(i, account));
threads[i].start();
}
for (int i = 0; i < numCards; i++) {
threads[i].join();
}
} catch (Exception e) {
System.err.println("All three arguments should be integers");
System.err.println("\t<No. of card holders> <main acct starting bal.> <backup acct. starting bal.>");
}
printStatement();
}
// Create an account - initalisation goes in here
public Account(String name, int bal) {
Account.name = name;
this.balance = bal;
}
// Deposit <balance> into the account
public synchronized void deposit(int cardholder, int balance) {
balance = balance + balance;
notify();
array.add(array.size()+"("+cardholder+")"+"\t"+"\t"+balance+"\t"+ balance+"\n");
cardholder++;
}
// Withdraw <balance> from the account
public synchronized void withdraw(int cardholder, int balance) {
if (balance < balance) { //
try {
System.err.println("Not enough money");
wait();
} catch (Exception e) {
e.printStackTrace();
}
}
balance = balance - balance;
array.add(array.size()+"("+cardholder+")"+"\t"+balance+"\t"+"\t"+ balance+"\n");
cardholder++;
}
// Print out the statement of transactions
public static void printStatement() {
System.out.printf("%s\n", "Account \"" + name + "\":"); // cant figure out how to arrange it into rows/columns
System.out.println(array);
}
}
CardHolder.java
public class CardHolder implements Runnable {
private int id;
private Account account;
final static int numIterations = 20;
public CardHolder(int id, Account account) {
this.id = id;
this.account = account;
}
/*
* run method is what is executed when you start a Thread that
* is initialised with an instance of this class.
* You will need to add code to keep track of local balance (cash
* in hand) and report this when the thread completes.
*/
public void run() {
for (int i = 0; i < numIterations; i++) {
// Generate a random amount from 1-10
int amount = (int)(Math.random()*10)+1;
// Then with 50/50 chance, either deposit or withdraw it
if (Math.random() > 0.5) {
account.withdraw(id, amount);
} else {
account.deposit(id, amount);
}
try {
Thread.sleep(200);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("THREAD "+ id + " finished");
}
}
Nur einen Kopf hoch in Ihrer 'Zurückziehen' (und anderen Orten) Methode verwenden Sie einfach die Variable' balance', wo Sie 'this.balance' verwenden wollten – Kevin