Java 私有实例变量和公共方法
私有实例变量和公共方法
实例源码：
源代码：
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public class Main {3
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public static void main(String[] args) {5
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MyCredit ac = new MyCredit();7
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double balance = ac.getBalance();/**from n o w j a v a . c o m**/9
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System.out.println("Balance = " + balance);11
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ac.credit(24.718);14
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ac.debit(10.112);16
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balance = ac.getBalance();19
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System.out.println("Balance = " + balance);21
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// Attempt to credit and debit invalid amounts24
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ac.credit(-24.90);26
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ac.debit(Double.POSITIVE_INFINITY);28
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balance = ac.getBalance();31
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System.out.println("Balance = " + balance);33
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// Attempt to debit more than the balance36
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ac.debit(200.00);38
// from N o w J a v a . c o m - 时代Java39
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balance = ac.getBalance();41
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System.out.println("Balance = " + balance);43
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}45
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}47
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class MyCredit {50
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private double balance;52
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// Return the balance of this account54
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public double getBalance() {56
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return this.balance;58
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}60
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public int credit(double amount) {63
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if (amount < 0.0 || Double.isNaN(amount) || Double.isInfinite(amount)) {65
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System.out.println("Invalid credit amount: " + amount);67
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return -1;69
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}71
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System.out.println("Crediting amount: " + amount);73
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this.balance = this.balance + amount;75
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return 1;77
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}79
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public int debit(double amount) {82
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if (amount < 0.0 || Double.isNaN(amount) || Double.isInfinite(amount)) {84
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System.out.println("Invalid debit amount: " + amount);86
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return -1;88
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}90
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