Java出现No enclosing instance of type Test is accessible. Must qualify the allocation with an enclosin

最近研究LDA源代码时，里面涉及到Comparable方法的使用。以前用过这个排序方法，现在想回顾一下。以下是程序，感觉没问题啊，结果报错了：

Exception in thread "main" java.lang.Error: Unresolved compilation problem: No enclosing instance of type Test is accessible. Must qualify the allocation with an enclosing instance of type Test (e.g. x.new A() where x is an instance of Test).

以下是代码程序：

package collection;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;public class Test {/*** 根据order对User排序*/public  class Student implements Comparable<Student>{private String name;private Integer grade;public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getGrade() {return grade;}public void setGrade(Integer grade) {this.grade = grade;}public int compareTo(Student arg0) {return this.getGrade().compareTo(arg0.getGrade());}}public static void main(String[] args) {Student student1 = new Student();student1.setName("a");student1.setGrade(80);Student student2 = new Student();student2.setName("b");student2.setGrade(59);List<Student> list = new ArrayList<Student>();list.add(student1);list.add(student2);Collections.sort(list);for(Student u : list){System.out.println(u.getName());}}}

于是百度谷歌了一下相关资料。原来我写的内部类是动态的，也就是开头以public class开头。而主程序是public static class main。在Java中，类中的静态方法不能直接调用动态方法。只有将某个内部类修饰为静态类，然后才能够在静态类中调用该类的成员变量与成员方法。所以在不做其他变动的情况下，最简单的解决办法是将public class改为public static class.

package collection;import java.util.ArrayList;
import java.util.Collections;
import java.util.List;public class Test {/*** 根据order对User排序*/public static class Student implements Comparable<Student>{private String name;private Integer grade;public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getGrade() {return grade;}public void setGrade(Integer grade) {this.grade = grade;}public int compareTo(Student arg0) {return this.getGrade().compareTo(arg0.getGrade());}}public static void main(String[] args) {Student student1 = new Student();student1.setName("a");student1.setGrade(80);Student student2 = new Student();student2.setName("b");student2.setGrade(59);List<Student> list = new ArrayList<Student>();list.add(student1);list.add(student2);Collections.sort(list);for(Student u : list){System.out.println(u.getName());}}}

再次运行，发现没问题了。

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