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public class Main { public static void main(String[] args) { p(onlyReturn("こんにちは！")); p(onlyReturn(123)); p(onlyReturn(new Cat(3))); } public static <T> void p(T a) { System.out.println(a); } public static <T> T onlyReturn(T a) { return a; } } abstract class Animal { protected int age; protected Animal(int age) { this.age = age; } abstract String cry(); } class Cat extends Animal { public Cat(int age) { super(age); } @Override public String cry() { return "にゃー(" + this.age + ")"; } @Override public String toString() { return this.cry(); } } |
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こんにちは！ 123 にゃー(3) |
