适配器模式

package com.Adapter;
//适配器模式的作用是实现功能的增加和接口的匹配
//和装饰起来说，一个是对功能的丰富，一个是对功能的增加
public class AdapterTest {
	public static void main(String[] args)
	{
		//利用继承的方式实现
		Target t=new AddAdapter();
		System.out.println(t.add(1));
		System.out.println(t.add(1,2));
		//利用组合的方式来实现
		Target t2=new AddAdapter2(new SourceImpl());
		System.out.println(t2.add(1));
		System.out.println(t2.add(1,2));
		
		
		
	}

}

package com.Adapter;

public class AddAdapter  extends SourceImpl implements Target{

	@Override
	public int add(int a) {
		return add(a,1);//调用父类的add方法，也就是进行转化
			}

}

package com.Adapter;

public class AddAdapter2 implements Target{

	private Source source;
	public AddAdapter2(Source source)
	{
		this.source=source;
	}
	@Override
	public int add(int a) {
		return this.source.add(a, 1);
	}

	@Override
	public int add(int a, int b) {
		return this.source.add(a, b);
	}

}

package com.Adapter;

public interface Source {
	public int add(int a,int b);

}

package com.Adapter;

public class SourceImpl implements Source {
 public int add(int a,int b)
 {  return a+b;}
}

package com.Adapter;
//目标所需的功能
public interface Target {
	public int add(int a);
    public int add(int a,int b);
}