第七题怎么写
求解答
2 回答
//类
public class Circle {
//私有属性radius
private int radius;
//getter、setter
public int getRadius(){
return radius;
}
public void setRadius(int radius){
this.radius = radius;
}
//构造方法
public Circle() {} //无参构造
public Circle(int radius){
this.radius = radius;
}
//比较方法
public void compareCircle(Circle c){
if(this.radius>c.radius){
System.out.println("该圆比较大！");
}else if(this.radius<c.radius){
System.out.println("该圆比较小！");
}else{
System.out.println("两个圆相等！");
}
}
}
//主函数入口
public static void main(String[] args) {
//默认构造 半径为5
Circle circle1 = new Circle();
circle1.setRadius(5);
//带参构造
Circle circle2 = new Circle(8);
Circle circle3 = new Circle(10);
Circle circle4 = new Circle(5);
//比较
circle1.compareCircle(circle2);
circle1.compareCircle(circle3);
circle1.compareCircle(circle4);
}
public class Geometry{
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;
/** construct a default geometry object*/
public Geometry(){
dateCreated = new java.util.Date();
}
/** construct a geometry object with specified color and filled value */
public Geometry( String color, boolean filled ){
dateCreated = new java.util.Date();
this.color = color;
this.filled = filled;
}
/** return color */
public String getColor(){
return color;
}
/** set a new color */
public void setColor( String color ){
this.color = color;
}
/** return filled */
public boolean isFilled(){
return filled;
}
/** set a new filled */
public void setFilled( boolean filled ){
this.filled = filled;
}
/** get dateCreated */
public java.util.Date getDateCreated(){
return dateCreated;
}
/** return a string representation of the object */
public String toString(){
return "Geometry created on " + dateCreated + "\ncolor: " + color + "\nfilled is: " + filled;
}
}
public class Circle extends Geometry{
private double radius;
public Circle(){
}
public Circle( double radius ){
this.radius = radius;
}
public Circle( double radius, String color, boolean filled ){
super( color, filled );
this.radius = radius;
// setColor( color );
// setFilled( filled );
// this.color = color;
// this.filled = filled;
}
/** return radius */
public double getRadius(){
return radius;
}
/** set a new radius */
public void setRadius( double radius ){
this.radius = radius;
}
/** return area */
public double getArea(){
return Math.PI * radius * radius;
}
/** return perimeter */
public double getPerimeter(){
return 2 * radius * Math.PI;
}
/** return diameter */
public double getDiameter(){
return 2 * radius;
}
/** print circle info */
public void printCircle(){
System.out.println( "The circle is created " + super.getDateCreated() + " and radius is " + radius );
}
/** return a string representation of the object */
public String toString(){
return super.toString() + "\nradius is : " + radius;
}
public String getColorCircle(){
return super.getColor();
}
public boolean equals( Object obj ){
if( obj instanceof Circle ){
return radius == ((Circle)obj).radius;
}
else
return false;
}
}
public class Rectangle extends Geometry{
private double width;
private double height;
public Rectangle(){
}
public Rectangle( double width, double height ){
this.width = width;
this.height = height;
}
public Rectangle( double width, double height, String color, boolean filled ){
super( color, filled );
this.width = width;
this.height = height;
}
/** return width */
public double getWidth(){
return width;
}
/** set a new width */
public void setWidth(double width){
this.width = width;
}
/** get height */
public double getHeight(){
return height;
}
/** set a new height */
public void setHeight( double height ){
this.height = height;
}
/** return area */
public double getArea(){
return width * height;
}
/** return perimeter */
public double getPerimeter(){
return 2 * ( width + height );
}
/** return a string representation of the object */
public String toString(){
return super.toString() + "\nwidth is : " + width + "\nheight is : " + height;
}
}
public class TestGeometry{
public static void main( String[] args ){
Geometry geo = new Geometry();
Rectangle rec = new Rectangle( 4.0, 5.0 );
Circle cir = new Circle( 2.0 );
System.out.println( geo.toString() );
System.out.println( rec.toString() );
System.out.println( rec.getArea() );
System.out.println( rec.getPerimeter() );
System.out.println( cir.toString() );
System.out.println( cir.getArea() );
System.out.println( cir.getPerimeter() );
}
}
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