方法fill（obj []，object val）有什么作用？
java.util.Arrays类的 fill（Object[]a，Objectval）方法将指定的Object引用分配给指定的Objects数组的每个元素。
示例
import java.util.Arrays;
public class ArrayDemo {
public static void main(String[] args) {
Object arr[] = new Object[] {10.5, 5.6, 4.7, 2.9, 9.7};
System.out.println("Actual values: ");
for (Object value : arr) {
System.out.println("Value = " + value);
}
Arrays.fill(arr, 12.2);
System.out.println("New values after using fill() method: ");
for (Object value : arr) {
System.out.println("Value = " + value);
}
}
}输出结果
Actual values: Value = 10.5 Value = 5.6 Value = 4.7 Value = 2.9 Value = 9.7 New values after using fill() method: Value = 12.2 Value = 12.2 Value = 12.2 Value = 12.2 Value = 12.2