Java 中的数组 setDouble()方法
原文:https://www . geesforgeks . org/array-set double-method-in-Java/
java . lang . reflect . array . setDouble()是 Java 中的一个内置方法，用于将指定的 double 值设置为给定对象数组的指定索引。
语法:
Array.setDouble(Object []array, int index, double value)
参数:该方法取三个参数:
- 数组:这是一个将要更新的 Object 类型的数组。
- 索引:这是要更新的数组的索引。
- 值:这是在给定的数组的给定索引处设置的双倍值。
异常:该方法抛出以下异常:
- 空指针异常–当数组为空时。
- IllegalArgumentException–当给定的对象数组不是数组时。
-
ArrayIndexOutOfBoundsException– if the given index is not in the range of the size of the array.
下面是 Array.setDouble()方法的实现:
程序 1:
```java // Java code to demonstrate setDouble() // method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method public static void main(String[] args) { // Declaring and defining double array double f[] = { 1.0, 2.0, 3.0 };
// printing the array System.out.print("Before Set : "); for (double x : f) { System.out.print(x + " "); }
double value = 400.0;
// setDouble method of class Array Array.setDouble(f, 1, value);
// printing array System.out.print("\nAfter Set : "); for (double x : f) { System.out.print(x + " "); } } } ```
Output:
```java Before Set : 1.0 2.0 3.0 After Set : 1.0 400.0 3.0
```
程序 2: 演示 java.lang.NullPointerException
```java // Java code to demonstrate setDouble() // method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method public static void main(String[] args) { // Declaring and defining double array to null double b[] = null;
try { double c = 1.0;
// setDouble method of class Array // passing null array in parameters Array.setDouble(b, 5, c); } catch (Exception e) { System.out.println("Exception : " + e); } } } ```
Output:
```java Exception : java.lang.NullPointerException
```
程序 3: 演示 Java . lang . arrayindexoutofboundsexception
```java // Java code to demonstrate setDouble() // method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method public static void main(String[] args) { // Declaring and defining double array double b[] = { 1.0, 2.0, 3.0 };
try { double c = 1.0;
// setDouble method of class Array // passing index 5 when size is 3 Array.setDouble(b, 5, c); } catch (Exception e) { System.out.println("Exception : " + e); } } } ```
Output:
```java Exception : java.lang.ArrayIndexOutOfBoundsException
```
程序 4: 演示 Java . lang . illegalargumentexception
```java // Java code to demonstrate setDouble() // method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method public static void main(String[] args) { // Declaring and defining double variable double b = 2.0; try { double c = 1.0; // setDouble method of class Array // passing a variable as parameter // when an array is required instead Array.setDouble(b, 5, c); } catch (Exception e) { System.out.println("Exception : " + e); } } } ```
Output:
```java Exception : java.lang.IllegalArgumentException: Argument is not an array
```
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