Java Generics 简明教程
Java Generics - List
在 List 接口中，Java 提供了泛型支持。
Java has provided generic support in List interface.
Syntax
List<T> list = new ArrayList<T>();其中
Where
-
list − object of List interface.
-
T − The generic type parameter passed during list declaration.
Description
T 是传递给泛型接口 List 及其实现类 ArrayList 的类型参数。
The T is a type parameter passed to the generic interface List and its implemenation class ArrayList.
Example
使用任意你选择的编辑器创建以下 Java 程序。
Create the following java program using any editor of your choice.
package com.tutorialspoint;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class GenericsTester {
public static void main(String[] args) {
List<Integer> integerList = new ArrayList<Integer>();
integerList.add(Integer.valueOf(10));
integerList.add(Integer.valueOf(11));
List<String> stringList = new ArrayList<String>();
stringList.add("Hello World");
stringList.add("Hi World");
System.out.printf("Integer Value :%d\n", integerList.get(0));
System.out.printf("String Value :%s\n", stringList.get(0));
for(Integer data: integerList) {
System.out.printf("Integer Value :%d\n", data);
}
Iterator<String> stringIterator = stringList.iterator();
while(stringIterator.hasNext()) {
System.out.printf("String Value :%s\n", stringIterator.next());
}
}
}这会产生以下结果 −
This will produce the following result −