在另一个线程中,我找到了这个比较器(post的底部),用于对JTable列进行排序,这些列可以由整数,字符串或两者组成。我无法弄清楚如何将它应用于我的JTable。我的表之前使用的是自动创建的行排序器。我将其设置为false,我现在正在使用:
TableRowSorter<MyTableModel> rowSorter = new TableRowSorter<MyTableModel>();
jtable.setRowSorter(rowSorter);
rowSorter.setComparator(0, c1);
我得到一个索引超出范围的例外,说我提供了无效的范围。我的表有多列。这是应用比较器的正确方法吗?我觉得这不是这样做的方法。
Comparator c1 = new java.util.Comparator() {
/**
* Custom compare to sort numbers as numbers.
* Strings as strings, with numbers ordered before strings.
*
* @param o1
* @param o2
* @return
*/
@Override
public int compare(Object oo1, Object oo2) {
boolean isFirstNumeric, isSecondNumeric;
String o1 = oo1.toString(), o2 = oo2.toString();
isFirstNumeric = o1.matches("\\d+");
isSecondNumeric = o2.matches("\\d+");
if (isFirstNumeric) {
if (isSecondNumeric) {
return Integer.valueOf(o1).compareTo(Integer.valueOf(o2));
} else {
return -1; // numbers always smaller than letters
}
} else {
if (isSecondNumeric) {
return 1; // numbers always smaller than letters
} else {
isFirstNumeric = o1.split("[^0-9]")[0].matches("\\d+");
isSecondNumeric = o2.split("[^0-9]")[0].matches("\\d+");
if (isFirstNumeric) {
if (isSecondNumeric) {
int intCompare = Integer.valueOf(o1.split("[^0-9]")[0]).compareTo(Integer.valueOf(o2.split("[^0-9]")[0]));
if (intCompare == 0) {
return o1.compareToIgnoreCase(o2);
}
return intCompare;
} else {
return -1; // numbers always smaller than letters
}
} else {
if (isSecondNumeric) {
return 1; // numbers always smaller than letters
} else {
return o1.compareToIgnoreCase(o2);
}
}
}
}
}
};
答案 0 :(得分:7)
手动设置RowSorter时,您必须自己保持与模型同步:
TableRowSorter sorter = new TableRowSorter();
table.setRowSorter(sorter);
sorter.setModel(table.getModel());
sorter.setComparator(myComparator);
答案 1 :(得分:0)
@kleopatra,从原始文本文件中获取数据时可能没有模型,例如.csv。因此,所有列都是String,而其中有合法数字,因此您希望将这些列排序为数字,而不是字符串(因此避免着名的1&lt; 11&lt; 10000&lt; 2&lt; 2&lt; 200&lt; 200 ......)。
感谢user1202394找到了这个其他帖子,你能给我们提供链接吗?
我设法通过三个新的代码部分按预期工作:
Comparator myComparator = new java.util.Comparator() {
/**
* Custom compare to sort numbers as numbers.
* Strings as strings, with numbers ordered before strings.
*
* @param o1
* @param o2
* @return
*/
@Override
public int compare(Object oo1, Object oo2) {
boolean isFirstNumeric, isSecondNumeric;
String o1 = oo1.toString(), o2 = oo2.toString();
isFirstNumeric = o1.matches("\\d+");
isSecondNumeric = o2.matches("\\d+");
if (isFirstNumeric) {
if (isSecondNumeric) {
return Integer.valueOf(o1).compareTo(Integer.valueOf(o2));
} else {
return -1; // numbers always smaller than letters
}
} else {
if (isSecondNumeric) {
return 1; // numbers always smaller than letters
} else {
// Those lines throw ArrayIndexOutOfBoundsException
// isFirstNumeric = o1.split("[^0-9]")[0].matches("\\d+");
// isSecondNumeric = o2.split("[^0-9]")[0].matches("\\d+");
// Trying to parse String to Integer.
// If there is no Exception then Object is numeric, else it's not.
try{
Integer.parseInt(o1);
isFirstNumeric = true;
}catch(NumberFormatException e){
isFirstNumeric = false;
}
try{
Integer.parseInt(o2);
isSecondNumeric = true;
}catch(NumberFormatException e){
isSecondNumeric = false;
}
if (isFirstNumeric) {
if (isSecondNumeric) {
int intCompare = Integer.valueOf(o1.split("[^0-9]")[0]).compareTo(Integer.valueOf(o2.split("[^0-9]")[0]));
if (intCompare == 0) {
return o1.compareToIgnoreCase(o2);
}
return intCompare;
} else {
return -1; // numbers always smaller than letters
}
} else {
if (isSecondNumeric) {
return 1; // numbers always smaller than letters
} else {
return o1.compareToIgnoreCase(o2);
}
}
}
}
}
};
TableRowSorter sorter = new TableRowSorter();
table.setRowSorter(sorter);
sorter.setModel(table.getModel());
sorter.setComparator(myComparator);
// Apply Comparator to all columns
for(int i = 0 ; i < table.getColumnCount() ; i++)
rowSorter.setComparator(i, c1);