如何在Java中将对象数组转换为整数数组？
您可以通过以下方式之一将对象数组转换为整数数组：
通过将每个元素从整数数组复制到对象数组-
示例
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
int length = objArray.length;
int intArray[] = new int[length];
for(int i=0; i<length; i++){
intArray[i] = (int) objArray[i];
}
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}输出结果
Contents of the integer array: [21, 58, 69, 33, 65]
使用System类的arrayCopy()方法-
示例
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
int length = objArray.length;
Integer intArray[] = new Integer[length];
System.arraycopy(objArray, 0, intArray, 0, length);
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}输出结果
Contents of the integer array: [21, 58, 69, 33, 65]
使用arrays类的copyOf()方法-
示例
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
int length = objArray.length;
Integer[] intArray = Arrays.copyOf(objArray, length, Integer[].class);
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}输出结果
Contents of the integer array: [21, 58, 69, 33, 65]
使用List类的toArray()方法-
示例
import java.util.Arrays;
public class ObjectArrayToStringArray {
public static void main(String args[]){
Object[] objArray = {21, 58, 69, 33, 65};
Integer[] intArray = Arrays.asList(objArray).toArray(new Integer[0]);
System.out.println("Contents of the integer array: "+Arrays.toString(intArray));
}
}输出结果
Contents of the integer array: [21, 58, 69, 33, 65]
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