Java Array setBoolean()用法及代碼示例

java.lang.reflect.Array.setBoolean()方法是一種內置方法，用於將指定的布爾值設置為給定對象數組的指定索引。

用法:

Array.setBoolean(Object []array, int index, boolean value)

參數：此方法采用三個參數：

• array:要更新的Object類型的數組。
• index:要更新的數組的索引。
• value:給定的布爾值指數給定的數組。

返回類型：這是一個void(空)類型的方法，不會返回任何值。此更新生效到作為參數傳遞的Object數組上。

異常：此方法引發以下異常：

• NullPointerException –當數組為null時。
• IllegalArgumentException–當給定的對象數組不是數組時。
• ArrayIndexOutOfBoundsException–如果給定的索引不在數組的大小範圍內。

下麵是Array.setBoolean()方法的實現：

示例1:

// Java code to demonstrate setBoolean() 
// method of Array class 
  
import java.lang.reflect.Array; 
public class GfG { 
    // main method 
    public static void main(String[] args) 
    { 
        // Declaring and defining boolean array 
        boolean b[] = { true, false, true }; 
  
        // array before using setBoolean() 
        System.out.print("Before Set : "); 
  
        // printing the array 
        for (boolean x : b) { 
            System.out.print(x + " "); 
        } 
  
        // boolean value to be set 
        boolean value = true; 
  
        // setBoolean method of class Array 
        Array.setBoolean(b, 1, value); 
  
        // array after using setBoolean() 
        System.out.print("\nAfter Set : "); 
  
        // printing array 
        for (boolean x : b) { 
            System.out.print(x + " "); 
        } 
    } 
}

輸出：

Before Set : true false true 
After Set : true true true

示例2:演示java.lang.NullPointerException

// Java code to demonstrate setBoolean() 
// method of Array class 
  
import java.lang.reflect.Array; 
public class GfG { 
    // main method 
    public static void main(String[] args) 
    { 
        // Declaring and defining boolean array to null 
        boolean b[] = null; 
  
        try { 
            // boolean value to be set 
            boolean c = false; 
  
            // passing a null array as parameter 
            Array.setBoolean(b, 5, c); 
        } 
        catch (Exception e) { 
            System.out.println("Exception : " + e); 
        } 
    } 
}

輸出：

Exception : java.lang.NullPointerException

示例3:演示java.lang.ArrayIndexOutOfBoundsException

// Java code to demonstrate setBoolean() 
// method of Array class 
  
import java.lang.reflect.Array; 
public class GfG { 
    // main method 
    public static void main(String[] args) 
    { 
        // Declaring and defining boolean array 
        boolean b[] = { true, false, true }; 
  
        try { 
            // value to be set 
            boolean c = false; 
  
            // passing index as 5 when size is 3 
            Array.setBoolean(b, 5, c); 
        } 
        catch (Exception e) { 
            System.out.println("Exception : " + e); 
        } 
    } 
}

輸出：

Exception : java.lang.ArrayIndexOutOfBoundsException

示例4:演示java.lang.IllegalArgumentException

// Java code to demonstrate setBoolean() 
// method of Array class 
  
import java.lang.reflect.Array; 
public class GfG { 
    // main method 
    public static void main(String[] args) 
    { 
        // Declaring and defining boolean variable 
        boolean b = true; 
  
        try { 
            // value to be set 
            boolean c = false; 
  
            // passing variable in the place of an array 
            Array.setBoolean(b, 5, c); 
        } 
        catch (Exception e) { 
            System.out.println("Exception : " + e); 
        } 
    } 
}

輸出：

Exception : java.lang.IllegalArgumentException: Argument is not an array