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  • java===泛型

    package 泛型;
    
    import java.util.ArrayList;
    import java.util.Iterator;
    
    public class GenericDemo {
    
        public static void main(String[] args) {
            ArrayList<String> a1 = new ArrayList<String>();
            a1.add("乔丹");
            a1.add("科比");
            a1.add("奥尼尔");
            a1.add("詹姆斯");
            Iterator<String> it = a1.iterator();
            while(it.hasNext()){
                System.out.println(it.next());
            }
    
        }
    
    }
    package 泛型;
    
    import java.util.Iterator;
    import java.util.TreeSet;
    
    import 对象库.Person;
    import 比较器.comparator.ComparetorByAge;
    
    public class GenericDemo2 {
    
        public static void main(String[] args) {
            TreeSet<Person> t1 = new TreeSet<Person>(new ComparetorByAge());
            t1.add(new Person("刘德华",50));
            t1.add(new Person("梁朝伟",38));
            t1.add(new Person("周华健",45));
            t1.add(new Person("苏有朋",37));
            t1.add(new Person("王宝强",39));
            Iterator<Person> it = t1.iterator();
            while(it.hasNext()){
                Person p1 = it.next();
                System.out.println(p1.getName()+":"+p1.getAge());
            }
    
        }
    
    }
    package 泛型;
    
    import 对象库.Person;
    
    public class GenericDemo3 {
    
        public static void main(String[] args) {
            Tool<Person> t1 = new Tool<Person>();
            t1.setObject(new Person("Mr.tom", 23));
            Person p1=t1.getObject();
            System.out.println(p1.getName()+":"+p1.getAge());
            
            
    
        }
    
    }
    package 泛型;
    
    public class GenericDemo4 {
    
        public static void main(String[] args) {
            InterImpl<Integer> i1 = new InterImpl<Integer>();
            i1.show(5);
    
        }
    
    }
    //泛型接口
    interface Inter<T>{
        public void show(T t);
    }
    class InterImpl<Q> implements Inter<Q>{
        public void show(Q q){
            System.out.println(q);
        }
    }
    package 泛型;
    
    
    
    public class Tool <T>{
        private T t;
        public void setObject(T t){
            this.t=t;
        }
        public T getObject(){
            return t;
        }
        //泛型定义在方法
        //如果方法被static修饰,不能访问类上定义的泛型。只能将泛型定义在方法上;
        public <W> void show(W w){
            System.out.println(w);
        }
        public void print(T t){
            System.out.println(t);
        }
        public static <Y> void method(Y y){
            System.out.println("method:"+y);
        }
    }
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  • 原文地址:https://www.cnblogs.com/wangyinxu/p/6738048.html
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