Java servlet中此处不允许使用void类型
这是我的java类:Java servlet中此处不允许使用void类型,java,Java,这是我的java类: public String year, title,detail; public League(String year,String title,String detail) { this.year=year; this.title=title; this.detail=detail; } public void getTitle() { System.out.println(""+year+""+title+""+detail+"")
public String year, title,detail;
public League(String year,String title,String detail)
{
this.year=year;
this.title=title;
this.detail=detail;
}
public void getTitle()
{
System.out.println(""+year+""+title+""+detail+"");
}
这是我的servlet:
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
//Creats the set of league
leagueList=new LinkedList();
leagueList.add(new League("2003","Spring","Soccer League(Spring`03)"));
leagueList.add(new League("2003","Summer","Summer Soccer Fest"));
leagueList.add(new League("2003","Fall","Fall Soccer League"));
leagueList.add(new League("2004","Spring","Summer Soccer Fest"));
leagueList.add(new League("2004","Summer","Soccer League(Spring`03)"));
leagueList.add(new League("2004","Fall","Fall Soccer League"));
}
这是我的processRequest()方法
out.println();
迭代器项=leagueList.Iterator();
while(items.hasNext()){
out.println(“- ”+League.getTitle()+“
”);
}
out.println(“
”);
错误是:League.getTitle()//不允许使用void类型该错误具有很强的描述性。您将返回一个
void
,或者换句话说,getTitle
方法不返回任何内容。Java无法将void(nothing)的结果连接到字符串
更改方法以成为合适的getter:
public String getTitle() {
return title;
}
此外,还要为其他字段创建适当的getter方法:
//year field should be an int rather than a String
public String getYear() {
return year;
}
public String getDetail() {
return detail;
}
getTitle()
不返回任何内容(void
),您正在尝试将其添加到字符串中
使用以下命令:
public String getTitle()
{
return year + title + detail;
}
我遵循同样的方法,但现在它表明“非静态方法不能从静态上下文引用”。当我将成员变量和成员函数声明为静态时,什么也不会发生。@mukeshvishwas为什么要声明这些字段或方法
static
?那不好。请提供您的确切代码和您的想法。我从这里调用getter方法:out.println(“- ”);迭代器项=leagueList.Iterator();而(items.hasNext()){out.println(“
- ”+League.getYear()+” ”);out.println(“
- ”+League.getTitle()+” ”);}out.println(“
public String getTitle()
{
return year + title + detail;
}