Java 从字符串中获取数字
我有一个转换器,用于从组合框中获取或设置标签:Java 从字符串中获取数字,java,Java,我有一个转换器,用于从组合框中获取或设置标签: public class GroupConverter extends StringConverter<ListGroupsObj> { @Override public String toString(ListGroupsObj obj) { return obj.getGroupId() + " - " + obj.getGroupName(); } @Override
public class GroupConverter extends StringConverter<ListGroupsObj>
{
@Override
public String toString(ListGroupsObj obj)
{
return obj.getGroupId() + " - " + obj.getGroupName();
}
@Override
public ListGroupsObj fromString(String obj)
{
Scanner fi = new Scanner(obj);
//anything other than alphanumberic characters,
//comma, dot or negative sign is skipped
fi.useDelimiter("[^\\p{Alnum},\\.-]");
while (true)
{
if (fi.hasNextInt()){
//System.out.println("Int: " + fi.nextInt());
return ListGroupsObj.newInstance().groupId(fi.nextInt());
}
break;
}
//TODO when you type for example "45 - NextGroup" you want to take only tyhe number"
return ListGroupsObj.newInstance().groupId(fi.nextInt());
}
}
公共类GroupConverter扩展StringConverter
{
@凌驾
公共字符串到字符串(ListGroupsObj obj)
{
返回obj.getGroupId()+“-”+obj.getGroupName();
}
@凌驾
公共列表组SOBJ fromString(字符串对象)
{
扫描仪fi=新扫描仪(obj);
//除了字母数字字符以外的任何字符,
//跳过逗号、点或负号
fi.useDelimiter(“[^\\p{Alnum},\\\.-]”);
while(true)
{
if(fi.hasNextInt()){
//System.out.println(“Int:+fi.nextInt());
返回ListGroupsObj.newInstance().groupId(fi.nextInt());
}
打破
}
//TODO当您键入例如“45-NextGroup”时,您只想输入数字
返回ListGroupsObj.newInstance().groupId(fi.nextInt());
}
}
例如,当我键入“45-NextGroup”时,我只想从值中获取数字。您能帮我实现这一点吗?试试这个
String s="45 - Next";// the string from the box
int num=Integer.parseInt(s.split("-")[0].trim());
如果obj.getGroupId()返回字符串,您只需执行Integer.parseInt(obj.getGroupId());
类似于
String s="45 - Next";
String reg = "[0-9]+";
Pattern pattern = Pattern.compile(reg);
Matcher matcher = pattern.matcher(s);
while(matcher.find()) {
String numString = matcher.group();
int num = Integer.parseInt(numString);
System.out.println(num);
}