错误: 在类 com.zs.container.CollectionData 中找不到主方法, 请将主方法定义为: public static void main(String[] args)

错误: 在类 com.zs.container.CollectionData 中找不到主方法, 请将主方法定义为:

   public static void main(String[] args)

package com.zs.container;import java.util.ArrayList;import com.java.array.generator.CountingGenerator.String;import com.java.array.generator.CountingGenerator;import com.java.array.generator.Generator;public class CollectionData<T> extends ArrayList<T> {    public CollectionData(Generator<T> gen, int quantity) {        for (int i = 0; i < quantity; i++)            add(gen.next());    }    // A generic convenience method:    public static <T> CollectionData<T> list(Generator<T> gen, int quantity) {        return new CollectionData<T>(gen, quantity);    }    public static void main(String[] args) {        System.out.println("start");        Generator<java.lang.String> gen =new CountingGenerator.String();        ArrayList<java.lang.String> list=new CollectionData<java.lang.String>(gen,8);        System.out.println(list);    }}

Error: the class com. Zs. Container. Can't find the main method in the CollectionData, please will be the main method is defined as: Public static void main (String [] args)

what's wrong? of course i have the main method!why error happened??

suprise!when i remove this line " import com.java.array.generator.CountingGenerator.String;" it works well!why???

the com.java.array.generator.CountingGenerator.String code:package com.java.array.generator; public class CountingGenerator {    static char[] chars = ("abcdefghijklmnopqrstuvwxyz"            + "ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();    public static class Character implements Generator<java.lang.Character> {        int index = -1;        public java.lang.Character next() {            index = (index + 1) % chars.length;            return chars[index];        }    }    public static class String implements Generator<java.lang.String> {        private int length = 7;        Generator<java.lang.Character> cg = new Character();        public String() {        }        public String(int length) {            this.length = length;        }        public java.lang.String next() {            char[] buf = new char[length];            for (int i = 0; i < length; i++)                buf[i] = cg.next();            return new java.lang.String(buf);        }    }} 

解决：

Use

public static void main(java.langString[] args)

Why? Because the String is interpreted as

import com.java.array.generator.CountingGenerator.String;