方法的重载

package DemoArea;

public class area {
	private int A;
	private int B;
	private String Color;
	
	public int setarea( int a ,int b){
		A=a;
		B=b;
		return a+b;
	}
	
	
	public void setarea(String col){
		Color=col;
	}
	
	double area(){
		return A*B;
	}
	

	public void show() {
		// TODO Auto-generated method stub
		System.out.println("颜色是"+Color);
	}
	
}

package DemoArea;

public class Mainarea {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		area a=new area();
		
		int a1_b1;
		a1_b1=a.setarea(3,4);
		a.setarea("hs");
		
		
		System.out.println("面积是"+a.area());
		a.show();
	}

}