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added exercise7
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‎exercises/exercise7/Bank/.gradle/1.7/taskArtifacts/cache.properties‎

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#Tue Nov 05 09:48:36 CST 2013

‎exercises/exercise7/Bank/.gradle/1.7/taskArtifacts/cache.properties.lock‎

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‎exercises/exercise7/Bank/.gradle/1.7/taskArtifacts/fileHashes.bin‎

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‎exercises/exercise7/Bank/.gradle/1.7/taskArtifacts/fileSnapshots.bin‎

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‎exercises/exercise7/Bank/.gradle/1.7/taskArtifacts/outputFileStates.bin‎

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‎exercises/exercise7/Bank/.gradle/1.7/taskArtifacts/taskArtifacts.bin‎

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‎exercises/exercise7/Bank/build.gradle‎

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apply plugin: 'java'
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apply plugin:'application'
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mainClassName = "Main"

‎exercises/exercise7/Bank/src/main/java/Account.java‎

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class Account {
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String name;
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String number;
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Integer balance;
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}

‎exercises/exercise7/Bank/src/main/java/Bank.java‎

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class Bank {
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static Account account(String name, String number, Integer balance) {
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Account acct = new Account();
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acct.name = name;
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acct.number = number;
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acct.balance = balance;
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return acct;
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}
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static void deposit(Account acct, Integer amount) {
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if(amount <= 0) {
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throw new IllegalArgumentException("amount must be positive");
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}
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acct.balance += amount;
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}
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static void withdraw(Account acct, Integer amount) {
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if(amount > acct.balance) {
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throw new RuntimeException("balance not enough");
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}
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acct.balance -= amount;
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}
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static String toString(Account acct) {
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return String.format("Account(%s, %s, %d)",
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acct.name, acct.number, acct.balance);
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}
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}

‎exercises/exercise7/Bank/src/main/java/Main.java‎

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public class Main {
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public static void main(String[] args) {
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Account acct = Bank.account("Java", "001", 100);
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Bank.deposit(acct, 500);
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Bank.withdraw(acct, 200);
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System.out.println(Bank.toString(acct));
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}
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}

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