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ArrayListTest.java
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47 lines (38 loc) · 1.43 KB
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package Collection;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
public class ArrayListTest extends LinkedList{
public static void main(String[] args) {
Integer[] i={1,2,3};
Collection<Integer> collection=new ArrayList<>(Arrays.asList(i));
Collections.addAll(collection,4,5,6);
collection.addAll(Arrays.asList(7,8,9));
System.out.println(collection);
//得到Arrays的内部类
Class[] classes= Arrays.class.getDeclaredClasses();
for(Class c:classes){
System.out.println(c.getName().toString());
}
//随机排列collection中的值
Collections.shuffle((List<Integer>)collection);
System.out.println(collection);
//只保留参数collection参数中的值------交集
System.out.println(collection.retainAll(Arrays.asList(i)));
System.out.println(collection);
//List重载了addAll()方法，Collection中只有一个addAll
List<Integer> arrayList=(ArrayList<Integer>) collection;
//arrayList重载的addAll方法
arrayList.addAll(2, Arrays.asList(10,11,12));
System.out.println(arrayList);
Integer[] i2={1,1,1,1,1,1,1,1,1,1,1,1,1};
Object[] objects= arrayList.toArray(i2);
System.out.println(Arrays.asList(objects));
//////////////////////////java8-lambda表达式
Arrays.asList(objects).stream().forEach(s -> System.out.println(s));//java8
}
}