Java 出现 No enclosing instance of type Test1 is accessible.(转,自己也遇到了!)
最近在看Java,在编译写书上一个例子时,由于书上的代码只有一部分,于是就自己补了一个内部类。结果编译时出现:No enclosing instance of type E is accessible. Must qualify the allocation with an enclosing instance of type E(e.g. x.new A() where x is an instance of E). E指代我写的那个内部类。
根据提示,没有可访问的内部类E的实例,必须分配一个合适的内部类E的实例(如x.new A(),x必须是E的实例。)看着这句提示,我就纳闷了,我已经用new实例化了这个类,为什么还不行呢。
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.
另外一种解决方法:把这些类分开写,也就是把这几个class 放在不同的文件中,也可解决问题
summarize:
类中的静态方法不能直接调用动态方法。
1 2 3 package index01; 4 5 6 7 public class Test1 { 8 9 10 11 12 13 public static void main(String[] args){ 14 15 16 17 System.out.println("1"); 18 19 Person p1 = new Person("Andy","beijing","uic"); 20 21 System.out.println(p1.info()); 22 23 24 25 26 27 System.out.println("2"); 28 29 Teacher t1 = new Teacher("andy", "zhuhai ","uic ","student "); 30 31 System.out.println(t1.info()); 32 33 } 34 35 36 37 public static class Person { 38 39 private String name; 40 41 private String school; 42 43 private String location; 44 45 46 47 Person(String name, String school){ 48 49 this.name=name; 50 51 this.school=school; 52 53 } 54 55 Person(String name, String location, String school){ 56 57 this.name=name; 58 59 this.location=location; 60 61 this.school= school; 62 63 } 64 65 public String info(){ 66 67 return "name: "+ name+"\nlocation: "+ location +"\nschool: "+school; 68 69 } 70 71 } 72 73 public static class Teacher extends Person{ 74 75 private String position; 76 77 78 79 80 81 Teacher(String name, String school){ 82 83 super(name, school); 84 85 86 87 } 88 89 Teacher(String name, String location, String school){ 90 91 super(name, location, school); 92 93 94 95 } 96 97 Teacher(String name, String location, String school, String position){ 98 99 super(name, location, school); 100 101 this.position=position; 102 103 } 104 105 public String info(){ 106 107 return super.info()+"\nposition: "+ position; 108 109 } 110 111 } 112 113 } 114 115
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