importjava.util.ArrayList;importjava.util.List;publicclassFirstElementExample{publicstaticvoidmain(String[]args){// 创建一个包含整数的ArrayListList<Integer>numbers=newArrayList<>();numbers.add(1);numbers.add(2);numbers.add(3);// 获取列表的第一个元素intfirstElement=numbers.get(0);System.out.print...
Get方法其实就是从Object数组中取数据。 public E set(int index, E element) { RangeCheck(index); E oldValue = (E) elementData[index]; elementData[index] = element; return oldValue; } 1. 2. 3. 4. 5. 6. 7. Set方法有两个参数,第一个是索引,第二个是具体的值,作用就是将索引下的值变...
importjava.util.ArrayList;publicclassSetExample{publicstaticvoidmain(String[]args){ArrayList<String>list=newArrayList<>();list.add("吴亦凡");list.add("尚明君");list.add("王帆");// 将索引为0的元素替换为"吴晓波"StringoldElement=list.set(0,"吴晓波");System.out.println("替换前的元素是:"+old...
println("索引值为 2 的元素为: " + element); } }执行以上程序输出结果为:Numbers ArrayList: [22, 13, 35] 索引值为 2 的元素为: 35以上实例中,使用 get() 方法用于访问索引值为 2 的元素。注意:我们还可以使用 indexOf() 方法返回 ArrayList 中元素的索引值。要了解更多信息,请访问 Java ArrayList...
Learn to get the element from an ArrayList. We will be using ArrayList get() method to get the object at the specified index.
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TheindexOf()returns: 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...
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
有用过，ArrayList就是数组列表，主要用来装载数据，当我们装载的是基本类型的数据int，long，boolean，...
Returns the element at the specified position in this list. Java documentation forjava.util.ArrayList.get(int). Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution Licen...