1.

package q;

public class point {
    int x;
    int y;
 
    public point(int x0, int y0) {
        super();
        this.x = x0;
        this.y = y0;
    }
 
    public point() {
        super();
    }
 
    public String movePoint(int dx, int dy) {
        x = x + dx;
        y = y + dy;
           return("x是"+x+",y是"+y);
    }
 
    public static void main(String[] args) {
        point p1 = new point(1, 2);
        point p2 = new point(3, 4);
        System.out.println(p1.movePoint(1, 2));
        System.out.println(p2.movePoint(3, 4));
    }
}

 

 

 2.

package q;

public class Rectangle {
  int length;
  int width;
  public int getArea(int length,int width){
      return length*width;
  }
  public int getPer(int length,int width){
      return (length+width)*2;
  }
  public void showAll(){
      System.out.println("矩形的长是"+length+"矩形的宽是"+width+"周长是"+(length+width)*2+"面积是"+length*width);
  }
  public Rectangle(int length, int width) {
        super();
        this.length = length;
        this.width = width;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Rectangle r=new Rectangle(3, 6);
        r.showAll();
    }
}

 

 3.

package q;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         computer c=new computer();
            c.coulour='蓝';
            c.cpu=133;
            c.show();
            computer c1=new computer('黄',333);
            c1.show();
    }

}

package q;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         computer c=new computer();
            c.coulour='蓝';
            c.cpu=133;
            c.show();
            computer c1=new computer('黄',333);
            c1.show();
    }

}

 

 

package q;
public class Rectangle {  int length;  int width;  public int getArea(int length,int width){      return length*width;  }  public int getPer(int length,int width){      return (length+width)*2;  }  public void showAll(){      System.out.println("矩形的长是"+length+"矩形的宽是"+width+"周长是"+(length+width)*2+"面积是"+length*width);  }  public Rectangle(int length, int width) {        super();        this.length = length;        this.width = width;    }    public static void main(String[] args) {        // TODO Auto-generated method stub        Rectangle r=new Rectangle(3, 6);        r.showAll();    }}