//用泛型方法改进
public class Generic2 {
    public <T> void show(T t) {
        System.out.println(t);
    }
}

public static void main(String[] args) {
		Generic2 g1 = new Generic2();
        g1.show("张三");
        g1.show(18);
        g1.show(true);
        g1.show(3.14);
}