java 计算器代码
import org.eclipse.swt.graphics.Point;import org.eclipse.swt.widgets.Shell;import org.eclipse.swt.widgets.Display;import org.eclipse.swt.widgets.Button;import org.eclipse.swt.SWT;import org.eclipse.swt.widgets.Text;import org.eclipse.swt.graphics.Rectangle;import org.eclipse.swt.graphics.Color...