Question

我正在测试如何打印数组。我可以使用for loop进行打印，但是当我尝试使用Arrays.toString或Arrays.deepToString时却无法正常工作。这是一个例子

  package Week4;
  import java.util.Arrays; 
  public class prac2 {

/**
 * @param args
 */
public static void main(String[] args) {
    // TODO Auto-generated method stub
     String[][] array = new String[][] { 
                { "Elem11", "Elem12", "Elem13" }, 
                { "Elem21", "Elem22", "Elem23" },
                { "Elem31", "Elwm32", "Elem33" } };
            System.out.println(Arrays.deepToString(array));
}

}

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
Arrays cannot be resolved

at Week4.prac2.main(prac2.java:14)

我正在使用JRE1.8.0_20。这与图书馆有关吗？我正在使用eclipse。

Answer 1

我认为您使用的是IDE，它没有正确安装或不完整的软件包。

1. i ran your code in my IDE

2. import java.util.Arrays;

3. since you still have error i press `ctrl` then hover to `import java.util.Arrays;` which leads me to the `Arrays.class`

4. look to the hierarchy of the packages and looked where it came from `rt.jar` which contains all of the compiled class files for the base Java Runtime environment.

为什么Array.toString或Array.deepToString不起作用？

1 个答案: