从Java的默认包中导入静态类时出错[重复]

Question

我试图通过在util.java中定义一个静态方法来缩短system.out.println()。我想利用进一步缩短为print()的util.print()。所以我做了一个静态导入。

java与listofnumbers.java位于同一目录下。当我试图从一个tester类访问writeList（）时，我得到以下错误：

import java.io.*;
import java.util.List;
import java.util.ArrayList;
import static Util;

public class ListOfNumbers {
    ...
    ...
    public void writeList() {
    // The FileWriter constructor throws IOException, which must be caught.
        PrintWriter out = null;

        try {
            print("Entered try statement...");
            ...
        } catch (IOException | IndexOutOfBoundsException e){            
            print("Exception thrown: \n" + e.getMessage());
            ...
        }
    }
}

错误：

>> javac Tester.java && java Tester
.\ListOfNumbers.java:4: error: '.' expected
import static Util;
                  ^
.\ListOfNumbers.java:4: error: ';' expected
import static Util;
                   ^
.\ListOfNumbers.java:4: error: cannot find symbol
import static Util;
              ^
  symbol: class Util
.\ListOfNumbers.java:4: error: static import only from classes and interfaces
import static Util;
^
.\ListOfNumbers.java:24: error: cannot find symbol
                        print("Entered try statement...");
                        ^
  symbol:   method print(String)
  location: class ListOfNumbers
.\ListOfNumbers.java:34: error: cannot find symbol
                        print("Exception thrown: \n" + e.getMessage());
                        ^
  symbol:   method print(String)
  location: class ListOfNumbers
6 errors

Answer 1

下面的回答帮助我克服了这个问题！我猜这一定是个窃听器。

无法导入默认包中的Java静态成员！

Answer 2

您应该导入方法名

import static Util.print;

如果要从util导入所有静态方法：

import static Util.*;