Pattern Sample

import junit.framework.Assert;

abstract class DesignAnalysis0 {
    protected boolean afterObjectOperation(boolean originalResult) {
        return originalResult;
    }

    protected void beforeObjectChecked(Object object) {
        System.out.println("DesignAnalysis");
        Assert.assertNull("null values", object);

    }

    public boolean doAllErroeFreeOperation(Object object) {
        beforeObjectChecked(object);
        boolean result = doActualOperation(object);
        return afterObjectOperation(result);
    }

    public abstract boolean doActualOperation(Object obj);
}

abstract class DesignAnalysis1 extends DesignAnalysis0 {
    private Class type;
    DesignAnalysis1(Class type){
        this.type=type;
    }
@Override
    protected void beforeObjectChecked(Object object) {

        if (!type.isAssignableFrom(object.getClass())) {
            throw new IllegalArgumentException();
           
           

        }
   
   

    }

}
class DesignAnalysis2 extends DesignAnalysis1{

    DesignAnalysis2(Class type) {
        super(type);
        // TODO Auto-generated constructor stub
    }

    @Override
    public boolean doActualOperation(Object obj) {
        System.out.println("DesignAnalysis2");
        return false;
    }

   
   
   
}
public  class DesignAnalysis{
//    DesignAnalysis2 test=new DesignAnalysis2();
   
   
}