Java ArrayList set()用法及代码示例

java.util.ArrayList类的set()方法用于使用指定元素替换此列表中指定位置的元素。

用法:

public E set(int index, E element)

参数：此方法将以下参数作为参数。

index-替换元素的索引
element-要存储在指定位置的元素

返回值：此方法返回先前位于指定位置的元素。

异常：如果索引不在ArrayList的大小范围内，则此方法将引发IndexOutOfBoundsException。

以下示例说明了set()方法。

示例1:

// Java program to demonstrate 
// set() method 
// for Integer value 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) throws Exception 
    { 
        try { 
  
            // Creating object of ArrayList<Integer> 
            ArrayList<Integer> 
                arrlist = new ArrayList<Integer>(); 
  
            // Populating arrlist1 
            arrlist.add(1); 
            arrlist.add(2); 
            arrlist.add(3); 
            arrlist.add(4); 
            arrlist.add(5); 
  
            // print arrlist 
            System.out.println("Before operation: "
                               + arrlist); 
  
            // Replacing element at the index 3 with 30 
            // using method set() 
            int i = arrlist.set(3, 30); 
  
            // Print the modified arrlist 
            System.out.println("After operation: "
                               + arrlist); 
  
            // Print the Replaced element 
            System.out.println("Replaced element: "
                               + i); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("Exception thrown: "
                               + e); 
        } 
    } 
}

输出：

Before operation : [1, 2, 3, 4, 5]
After operation : [1, 2, 3, 30, 5]
Replaced element : 4

示例2:对于IndexOutOfBoundsException

// Java program to demonstrate 
// set() method 
// for IndexOutOfBoundsException 
  
import java.util.*; 
  
public class GFG1 { 
    public static void main(String[] argv) throws Exception 
    { 
        try { 
  
            // Creating object of ArrayList<Integer> 
            ArrayList<Integer> 
                arrlist = new ArrayList<Integer>(); 
  
            // Populating arrlist1 
            arrlist.add(1); 
            arrlist.add(2); 
            arrlist.add(3); 
            arrlist.add(4); 
            arrlist.add(5); 
  
            // print arrlist 
            System.out.println("Before operation : "
                               + arrlist); 
  
            // Replacing element at the index 7 with 30 
            // using method set() 
            System.out.println("\nTrying to Replace"
                               + " the element at"
                               + " (index > Capacity) "); 
            int i = arrlist.set(7, 30); 
  
            // Print the modified arrlist 
            System.out.println("After operation: "
                               + arrlist); 
  
            // Print the Replaced element 
            System.out.println("Replaced element: "
                               + i); 
        } 
  
        catch (IndexOutOfBoundsException e) { 
            System.out.println("Exception thrown : " + e); 
        } 
    } 
}

输出：

Before operation : [1, 2, 3, 4, 5]

Trying to Replace the element at (index > Capacity) 
Exception thrown : java.lang.IndexOutOfBoundsException: Index: 7, Size: 5

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 ArrayList set() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。