package test;import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.jface.dialogs.*;
public class testlabel {public testlabel() {final Display display = Display.getDefault();final Shell shell = new Shell();shell.setSize(370, 235);shell.setText("Text 综合实例");final Label label1 = new Label(shell, SWT.NONE);label1.setBounds(25, 25, 60, 25);label1.setText("User Name:");final Text text1 = new Text(shell, SWT.BORDER);text1.setBounds(90, 20, 80, 20);// 当光标停留在该文本框时将出现提示信息text1.setToolTipText("文本项不能为空");text1.selectAll();final Label labe2 = new Label(shell, SWT.NONE);labe2.setBounds(190, 25, 55, 25);labe2.setText("PassWord:");final Text text2 = new Text(shell, SWT.PASSWORD | SWT.BORDER);text2.setBounds(250, 20, 80, 20);// setTextLimit(int x)为常用组件方法，用来设置文本框中最多可输入的字符数。text2.setTextLimit(8);text2.setToolTipText("文本项不能为空,且输入不超过8 位密码");text2.showSelection();final Text text3 = new Text(shell, SWT.V_SCROLL | SWT.H_SCROLL | SWT.BORDER);text3.setBounds(50, 55, 250, 90);final Button button1 = new Button(shell, SWT.NONE);button1.setBounds(140, 160, 80, 20);button1.setText("OK");button1.setToolTipText("单击OK 按钮，姓名将显示在下面的文本中");button1.addSelectionListener(new SelectionAdapter() {public void widgetSelected(SelectionEvent e) {String AD = text1.getText();// 获得输入的文本内容。String BD = text2.getText();// 判断输入文本是否为空if (AD == null || AD.equals("") || BD == null || BD.equals("")){MessageDialog.openInformation(shell, " 信息提示", "失败信息！"+ '\n' + '\n' + " 注意：文本项不能为空！！！……");} elsetext3.append("User Name: " + '\n' + "" + AD + '\n'+ "PassWord:" + '\n' + "" + BD);/*** append()方法用来在文本框中显示内容。* 将append()方法改为insert()方法可达到同样的效果*/}});final Button button2 = new Button(shell, SWT.NONE);button2.setBounds(250, 160, 80, 20);button2.setText("Cancel");button2.setToolTipText("单击Cancel 按钮，清除文本中的内容");button2.addSelectionListener(new SelectionAdapter() {public void widgetSelected(SelectionEvent e) {text1.setFocus();text1.setSelection(0,1);        //测试的地方//text1.clearSelection();// 清除文本内容方法//text1.showSelection();text2.setText("");text3.setText("");}});shell.open();shell.layout();while (!shell.isDisposed()) {if (!display.readAndDispatch())display.sleep();}}public static void main(String[] args) {new testlabel();}
}

public void showSelection()

Shows the selection.

If the selection is already showing in the receiver, this method simply returns. Otherwise, lines are scrolled until the selection is visible.

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;public class MainClass {public static void main(String[] a) {Display d = new Display();Shell s = new Shell(d);Text text1 = new Text(s, SWT.WRAP | SWT.BORDER);text1.setBounds(100, 50, 100, 20);text1.setTextLimit(5);text1.setText("12345");Text text2 = new Text(s, SWT.SINGLE | SWT.BORDER);text2.setBounds(100, 75, 100, 20);text2.setTextLimit(30);FocusListener focusListener = new FocusListener() {public void focusGained(FocusEvent e) {Text t = (Text) e.widget;t.selectAll();}public void focusLost(FocusEvent e) {Text t = (Text) e.widget;if (t.getSelectionCount() > 0) {t.clearSelection();}}};text1.addFocusListener(focusListener);text2.addFocusListener(focusListener);s.open();while (!s.isDisposed()) {if (!d.readAndDispatch())d.sleep();}d.dispose();}
}

public Point getSelection()

Returns a Point whose x coordinate is the character position representing the start of the selected text, and whose y coordinate is the character position representing the end of the selection. An "empty" selection is indicated by the x and y coordinates having the same value.

Indexing is zero based. The range of a selection is from 0..N where N is the number of characters in the widget.