• 코드:
​x
 
1
interface Animal { public abstract void cry(); }
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​
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class Cat implements Animal {
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    public void cry() {
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        System.out.println("냐옹냐옹!");
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    }
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}
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​
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class Dog implements Animal {
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    public void cry() {
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        System.out.println("멍멍!");
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    }
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}
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​
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public class prog {
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    public static void main(String[] args) {
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        Cat c = new Cat();
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        Dog d = new Dog();
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        c.cry();
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        d.cry();
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    }
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}
표준입력 & 실행옵션