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...
Now I want to populate my raw input into onerootArchiveFolder, which will have all the files in the root dir of the ZIP in the ArchiveFile's ArrayList and any additional folders in the root dir of the ZIP in the ArchiveFolder's ArrayList (and this process can continue on like this lik...
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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 ...
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。
indexOf("alex"); System.out.println(index); Program output. 0 We can use this method to find if an object is present in the arraylist. If the object is present, then the return value will be greater than '-1‘. Happy Learning !! Read More: ArrayList Java Docs Weekly Newsletter Stay...
Eget(intindex) 1. 其中,E表示List中元素的类型,index表示要访问的元素的索引。get方法将返回指定索引位置的元素。 下面是一个示例代码,演示如何使用get方法获取List中的元素: importjava.util.ArrayList;importjava.util.List;publicclassListGetExample{publicstaticvoidmain(String[]args){List<String>fruits=newArrayL...
The following example shows the usage of Java ArrayList get(index) method for Strings. We're adding couple of Strings to the ArrayList object using add() method calls per element and using get(index) method, we're getting one of the element by index and printing it. ...
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...
ArrayList mySubAL = myAL.GetRange( 0, 5 ); Console.WriteLine( "Index 0 through 4 contains:" ); PrintValues( mySubAL, '\t' ); // Replaces the values of five elements starting at index 1 with the values in the ICollection. myAL.SetRange( 1, mySourceList ); // Displays the va...