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ArrayList大小(不包括)之间。 例如,如果ArrayList包含10个对象,那么有效的索引参数将在0到9之间(包括0和9)。 1.3. 返回值 get()方法返回指定索引位置处的对象的引用。 1.4. IndexOutOfBoundsException ...
get(int index)返回此列表中指定位置上的元素。[size=-1] int indexOf(Objecto)返回此列表中首次出现...
-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 “alex” in the given list. Note that string“alex”is present in the ...
Object[] r = findIndices(points, xi);booleanoutBounds = (boolean) r[2];if(outBounds) {returnDouble.NaN; }else{doublev, weight; Index index = values.getIndex();int[] indices = (int[]) r[0];double[] distances = (double[]) r[1]; v =0; List<Index> ii =newArrayList<>(); it...
Sometimes we needsubList from ArrayList in Java. For example, we have anArrayListof 10 objects and we only need 5 objects or we need an object from index 2 to 6, these are called subList in Java. Java collection API provides a method toget SubList from ArrayList. In this Java tutorial,...
Accessing rows/columns in MultiDimensional Arrays Accessing the first object in an ICollection Accessing the private method through an instance in a static method Accurate Integer part from double number Acess an arraylist from another class? Activator.Createinstance for internal constructor Active Directory...
Theget()method returns the reference of the object present at the specified index. 1.4.IndexOutOfBoundsException An invalid index argument will causeIndexOutOfBoundsExceptionerror. Exceptionin thread"main"java.lang.IndexOutOfBoundsException:Index:4,Size:4atjava.util.ArrayList.rangeCheck(ArrayList.java...
Objectobj=list.get(0);if(objinstanceofInteger){Integerelement=(Integer)obj;} 1. 2. 3. 4. 总的来说,在使用Java集合中的get方法时,需要注意索引范围、空指针和类型转换等常见错误。通过合理的判断和处理,可以避免这些错误并提高代码的稳定性和健壮性。
{foreach( Object objinmyList ) Console.Write("{0}{1}", mySeparator, obj ); Console.WriteLine(); } }/* This code produces the following output. Index 0 through 4 contains: The quick brown fox jumps Index 0 through 4 now contains: The big gray wolf jumps */...
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). ...