intx2=200;inty2=50;g2d.drawLine(x1,y1,x2,y2);}publicstaticvoidmain(String[]args){JFrameframe=newJFrame("Line Drawing Example");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(400,400);LineDra
class A { public A() { System.out.println("New A"); } } class B extends A { public B() { System.out.println("New B"); } } class Program { public static void main(String[ ] args) { B obj = new B(); } } /*Outputs "New A" "New B" */ ...
{ /** * 字段名称 */ String value(); /** * 导出排序先后: 数字越小越靠前(默认按Java类字段顺序导出) */ int sort() default 0; /** * 导出映射,格式如:0-未知;1-男;2-女 */ String kv() default ""; /** * 导出模板示例值(有值的话,直接取该值,不做映射) */ String example() ...
public class TemplateMethodExample { public static void main(String[] args) { AbstractClass template = new ConcreteClass(); template.templateMethod(); } } 15. 责任链模式(Chain of Responsibility) 问题: 在某些情况下,一个请求需要在多个对象之间传递,每个对象都可能处理该请求或将其传递给下一个...
我们可以往对象中添加一个 String 类型的 rowTips 字段,则可以直接拿到对应的错误信息。 比如,我们将表格中赵子龙的性别改为F(F并不是映射数据),将大乔的性别改为二十八(不能转换为Integer类型数据)。 Cotroller 代码略(和 1.2.2 完全一致)。 测试效果:可以看到,我们可以通过 rowTips 直接拿到对应的错误数据提示...
(Graphicsg){super.paintComponent(g);g.setColor(Color.RED);g.fillRect(50,50,200,100);}publicstaticvoidmain(String[]args){JFrameframe=newJFrame("Drawing Example");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(300,200);frame.add(newDrawingExample());frame.setVisible(true)...
{x+=2;// 每次移动2个像素if(x>getWidth())x=0;// 到达边缘则重置repaint();// 重绘}publicstaticvoidmain(String[]args){JFrameframe=newJFrame("Animated Circle Example");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(400,300);frame.add(newAnimatedCircle());frame....
return drawing; } PERSISTENCE_ORDER_PART_DETAILalso has a column,SPECIFICATION, of typeCLOB.CLOBstands for character large objects, which are used to store string data too large to be stored in aVARCHARcolumn.SPECIFICATIONis mapped to the fieldPart.specificationof typejava.lang.String. The@Lobann...
public void setText(String t) Sets the text of this TextComponent to the specified content, which is expected to be in the format of the content type of this editor. For example, if the type is set to text/html the string should be specified in terms of HTML. This is implemented to...
System.out.println("Drawing a circle"); } }classRectangleextendsShape {voiddraw() { System.out.println("Drawing a rectangle"); } }publicclassMain {publicstaticvoidmain(String[] args) { Circle circle=newCircle(); circle.draw(); circle.display(); ...