Java 为什么Array.toString或Array.deepToString不工作？

我正在测试如何打印阵列。我可以使用

for loop

打印它，但当我尝试使用

数组时，toString

或

数组。deepToString

就是不起作用。这里有一个例子

  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));
}

}

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我正在使用JRE1.8.020。这和图书馆有关吗？我正在使用eclipse

我认为您使用的是IDE，它没有正确安装或软件包不完整

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.

---

方法名称没有大写。尝试

deepToString

而不是

deepToString

。是的，我知道，但问题是（数组）无法识别。它提供了快速修复您是否为

java.util.array

添加了

import

语句？我刚刚运行了您的代码，它工作正常。我只是

import java.util.Arrays

@user2775042尝试下载rt.jar，然后将其添加到构建路径下载rt.jar并放入构建路径。现在它正在工作。谢谢

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.