String firstElement = list.get(0); //a String sixthElement = list.get(5); //f 1. ArrayList get() 方法 ArrayList.get(int index)方法返回列表中指定位置’index’处的元素。 1.1. 语法 public Object get( int index ); 1.2. 方法参数 index – 要返回的元素的索引。有效的索引始终在0(包括)到...
index– the index position of the element if the element is found. -1– if the element is NOT found. 2.ArrayList.indexOf()Example The following Java program gets the first index of an object in the arraylist. In this example, we are looking for the first occurrence of the string “ale...
ArrayList<String>places=newArrayList<String>(Arrays.asList("a","b","c","d","e","f"));StringfirstElement=list.get(0);//aStringsixthElement=list.get(5);//f 1. ArrayListget()Method TheArrayList.get(int index)method returns the element at the specified position'index'in the list. 1.1...
index Int32 index of the element to return Returns Object the element at the specified position in this list Implements Get(Int32) Attributes RegisterAttribute Remarks Returns the element at the specified position in this list. Java documentation forjava.util.ArrayList.get(int). ...
It is programmers need to choose or select or get or find a random element or number or string and a random index of an Array or ArrayList in Java. Let us explore Math.random() method with examples. The same code can be used to implement a Lottery Draw t
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ArrayList public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable add方法: /*** Appends the specified element to the end of this list. * *@parame element to be appended to this list ...
public class test {public static void main(String[] args) {ArrayList<Integer> a = new ArrayList...
// Vector 中的 get 操作添加了 synchronizedpublicsynchronizedEget(int index){if(index>=elementCount)thrownewArrayIndexOutOfBoundsException(index);returnelementData(index);} SynchronizedList 类的 ge t 方法: 代码语言:javascript 代码运行次数:0
(int index){ CountryEnum[] myArray = CountryEnum.values(); for(CountryEnum element : myArray){ if(index == element.getRetCode()) return element; } return null; } } import java.util.concurrent.CountDownLatch; public class CountDownLatchDemo { public static void main(String[] args) ...