import java.util.StringJoiner;
public class Test {
    public static void main(String[] args) {
        String[] fields = {"name","position","salary"}; 
        String table = "employee";        
        String select = buildSelectSql(table,fields);        
        System.out.println(select);        
        System.out.println("Select name,position,salary from employee".equals(select) ? "测试成功":"测试失败");    
    }

    static String buildSelectSql(String table,String[] fields){
        StringJoiner sj = new StringJoiner(",","Select "," from "+table);
        for(String f:fields){           
            sj.add(f);        
        }
        return sj.toString();    
    }
}