Java 如何对SWT列进行降序排序
如何进行升序和降序排序。在下面的SWT代码中,升序成功,但当我单击表格标题时,降序不起作用。该怎么办 下面是我的代码Java 如何对SWT列进行降序排序,java,sorting,swt,Java,Sorting,Swt,如何进行升序和降序排序。在下面的SWT代码中,升序成功,但当我单击表格标题时,降序不起作用。该怎么办 下面是我的代码 package test; import java.text.DecimalFormat; import java.text.NumberFormat; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Collections; import java.util.C
package test;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
public class SortTable {
private TableRow rows[] = new TableRow[] {
new TableRow(1, "aaa", new Date(1363784269000L), 0.000565529),
new TableRow(2, "abc", new Date(1367784269000L),1.09E-06),
new TableRow(3, "efc", new Date(1363584269000L),0.000273487),
new TableRow(4, "ccc", new Date(1363734269000L),0.000170431),
new TableRow(5, "ddd", new Date(1363734269000L),1.09E-06),
new TableRow(6, "fff", new Date(1363734269000L),0.000273487),
new TableRow(7, "ggg", new Date(1363734269000L),0.000170431),
};
private Table table;
private TableColumn intColumn;
private TableColumn strColumn;
private TableColumn dateColumn;
private TableColumn scientificColumn;
public SortTable() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
table = new Table(shell, SWT.BORDER);
table.setHeaderVisible(true);
intColumn = new TableColumn(table, SWT.NONE);
intColumn.setText("int");
intColumn.setWidth(50);
strColumn = new TableColumn(table, SWT.NONE);
strColumn.setText("string");
strColumn.setWidth(50);
dateColumn = new TableColumn(table, SWT.NONE);
dateColumn.setText("date");
dateColumn.setWidth(100);
scientificColumn = new TableColumn(table, SWT.NONE);
scientificColumn.setText("scientificvalue");
scientificColumn.setWidth(100);
updateTable();
Listener sortListener = new Listener() {
public void handleEvent(Event e) {
TableColumn column = (TableColumn) e.widget;
if (column == intColumn) Arrays.sort(rows, BY_VAL);
if (column == strColumn) Arrays.sort(rows, BY_STR);
if (column == dateColumn) Arrays.sort(rows, BY_DATE);
if (column == scientificColumn) Arrays.sort(rows,BY_VAL );
table.setSortColumn(column);
updateTable();
}
};
Listener reverseSortListener = new Listener() {
public void handleEvent(Event e) {
TableColumn column = (TableColumn) e.widget;
if (column == intColumn) Arrays.sort(rows, Collections.reverseOrder());
if (column == strColumn) Arrays.sort(rows, Collections.reverseOrder());
if (column == dateColumn) Arrays.sort(rows, Collections.reverseOrder());
if (column == scientificColumn) Arrays.sort(rows,Collections.reverseOrder() );
table.setSortColumn(column);
updateTable();
}
};
// intColumn.addListener(SWT.Selection, sortListener);
// strColumn.addListener(SWT.Selection, sortListener);
// dateColumn.addListener(SWT.Selection, sortListener);
// scientificColumn.addListener(SWT.Selection, sortListener);
intColumn.addListener(SWT.Selection, reverseSortListener);
strColumn.addListener(SWT.Selection, reverseSortListener);
dateColumn.addListener(SWT.Selection, reverseSortListener);
scientificColumn.addListener(SWT.Selection, reverseSortListener);
shell.setSize(shell.computeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
private void updateTable() {
table.removeAll();
for (TableRow row : rows) {
TableItem item = new TableItem(table, SWT.NONE);
// item.setText(row.asString());
item.setText(row.asDouble());
}
}
public final Comparator<TableRow> BY_VAL = new Comparator<TableRow>() {
@Override
public int compare(TableRow o1, TableRow o2) {
if (o1.val < o2.val) return -1;
if (o1.val > o2.val) return 1;
return 0;
}
};
public final Comparator<TableRow> BY_STR = new Comparator<TableRow>() {
@Override
public int compare(TableRow o1, TableRow o2) {
return o1.str.compareTo(o2.str);
}
};
public final Comparator<TableRow> BY_DATE = new Comparator<TableRow>() {
@Override
public int compare(TableRow o1, TableRow o2) {
return o1.date.compareTo(o2.date);
}
};
private class TableRow {
private int val;
private String str;
private Date date;
private double sciVal;
private SimpleDateFormat format = new SimpleDateFormat();
// private NumberFormat formatter = new DecimalFormat("###.#####");
public TableRow(int val, String str, Date date, double sciVal) {
this.val = val;
this.str = str;
this.date = date;
this.sciVal = sciVal;
}
public String[] asString() {
return new String[] {Integer.toString(val), str, format.format(date)};
}
public String[] asDouble() {
return new String[] {Integer.toString(val), str, format.format(date),String.format("%.3E", sciVal)};
}
}
public static void main(String[] args) {
new SortTable();
}
封装测试;
导入java.text.DecimalFormat;
导入java.text.NumberFormat;
导入java.text.simpleDataFormat;
导入java.util.array;
导入java.util.Collections;
导入java.util.Comparator;
导入java.util.Date;
导入org.eclipse.swt.swt;
导入org.eclipse.swt.layout.FillLayout;
导入org.eclipse.swt.widgets.Display;
导入org.eclipse.swt.widgets.Event;
导入org.eclipse.swt.widgets.Listener;
导入org.eclipse.swt.widgets.Shell;
导入org.eclipse.swt.widgets.Table;
导入org.eclipse.swt.widgets.TableColumn;
导入org.eclipse.swt.widgets.TableItem;
公共类可排序{
私有表行[]=新表行[]{
新表行(1,“aaa”,新日期(1363784269000L),0.000565529),
新表行(2,“abc”,新日期(1367784269000L),1.09E-06),
新表格行(3,“efc”,新日期(1363584269000L),0.000273487),
新表行(4,“ccc”,新日期(1363734269000L),0.000170431),
新表行(5,“ddd”,新日期(1363734269000L),1.09E-06),
新表格行(6,“fff”,新日期(1363734269000L),0.000273487),
新表格行(7,“ggg”,新日期(1363734269000L),0.000170431),
};
私人餐桌;
private TableColumn intColumn;
私有表列结构列;
私有表列dateColumn;
私有表列科学列;
公共排序表(){
显示=新显示();
外壳=新外壳(显示);
setLayout(新的FillLayout());
表=新表(外壳、SWT.边框);
表.setheadervible(true);
intColumn=新表列(表,SWT.NONE);
intColumn.setText(“int”);
intColumn.setWidth(50);
strColumn=新表列(表,SWT.NONE);
strColumn.setText(“字符串”);
立柱设置宽度(50);
dateColumn=新表列(表,SWT.NONE);
dateColumn.setText(“日期”);
dateColumn.setWidth(100);
scientificColumn=新表列(表,SWT.NONE);
scientificColumn.setText(“scientificvalue”);
科学列。设置宽度(100);
updateTable();
Listener sortListener=new Listener(){
公共无效handleEvent(事件e){
TableColumn=(TableColumn)e.widget;
if(column==intColumn)array.sort(rows,BY_VAL);
if(column==strColumn)Arrays.sort(rows,BY_STR);
if(column==dateColumn)Arrays.sort(行,按日期);
if(column==scientificColumn)array.sort(rows,BY_VAL);
表1.setSortColumn(列);
updateTable();
}
};
Listener reverseSortListener=new Listener(){
公共无效handleEvent(事件e){
TableColumn=(TableColumn)e.widget;
if(column==intColumn)Arrays.sort(rows,Collections.reverseOrder());
if(column==strColumn)Arrays.sort(rows,Collections.reverseOrder());
if(column==dateColumn)Arrays.sort(rows,Collections.reverseOrder());
if(column==scientificColumn)array.sort(rows,Collections.reverseOrder());
表1.setSortColumn(列);
updateTable();
}
};
//addListener(SWT.Selection,sortListener);
//strColumn.addListener(SWT.Selection,sortListener);
//dateColumn.addListener(SWT.Selection,sortListener);
//scientificColumn.addListener(SWT.Selection,sortListener);
addListener(SWT.Selection,reverseSortListener);
strColumn.addListener(SWT.Selection,reverseSortListener);
addListener(SWT.Selection,reverseSortListener);
scientificColumn.addListener(SWT.Selection,reverseSortListener);
shell.setSize(shell.computeSize(SWT.DEFAULT,SWT.DEFAULT).x300);
shell.open();
而(!shell.isDisposed()){
如果(!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
私有void updateTable(){
table.removeAll();
用于(表格行:行){
TableItem项目=新的TableItem(表,SWT.NONE);
//item.setText(row.asString());
item.setText(row.asDouble());
}
}
公共最终比较器由_VAL=新比较器()提供{
@凌驾
公共整数比较(表行o1,表行o2){
如果(o1.valo2.val)返回1;
返回0;
}
};
_STR=新比较器()的公共最终比较器{
@凌驾
公共整数比较(表行o1,表行o2){
返回o1.str.compareTo(o2.str);
}
};
截止日期的公共最终比较器=新比较器(){
@凌驾
公共整数比较(表行o1,表行o2){
返回o1.日期比较(o2.日期);
}
};
私人类表格行{
私人国际旅行社;
私有字符串str;
私人日期;
私人双保险;
私有SimpleDataFormat格式=新SimpleDataFormat();
//private NumberFormat formatter=新的十进制格式(“####.#####”);
公共表行(int-val、String-str、Date-Date、double-sciVal){
this.val=val;
this.str=str;
this.date=日期;
this.sciVal=sciVal;
}
公共字符串[]asString(){
返回新字符串[]{Integer.toString(val),str,format.format(date)};
}
公共字符串[]asDouble(){
返回新字符串[]{Integer.toString(val),str,format.format(date),String.format(“%.3E”,sciVal)};
}
}
公共静态void main(字符串[]args){
新的排序表();
}
}
Collections.reverseOrder()
返回一个比较器,该比较器根据数组内容的自然顺序对数组进行反向排序。这不是您在这里所需要的,因为您希望对列进行排序
改用