Bean Builder

gistfile1.java

public class MyBean {
    private Object foo;
    private Object bar;
    
    public MyBean() {
    }
    
    private MyBean(MyBean myBean) {
        this.setFoo(myBean.getBar());
        this.setBar(myBean.getBar());
    }
    
    public Object getFoo() {
        return foo;
    }
    public void setFoo(Object foo) {
        this.foo = foo;
    }
    public Object getBar() {
        return bar;
    }
    public void setBar(Object bar) {
        this.bar = bar;
    }
    
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((bar == null) ? 0 : bar.hashCode());
        result = prime * result + ((foo == null) ? 0 : foo.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        MyBean other = (MyBean) obj;
        if (bar == null) {
            if (other.bar != null)
                return false;
        }
        else if (!bar.equals(other.bar))
            return false;
        if (foo == null) {
            if (other.foo != null)
                return false;
        }
        else if (!foo.equals(other.foo))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "MyBean [foo=" + foo + ", bar=" + bar + "]";
    }

    public static class Builder {
        private final MyBean myBean;
        
        public Builder() {
            myBean = new MyBean();
        }
        
        public Builder setFoo(Object foo) {
            this.myBean.setFoo(foo);
            return this;
        }
        
        public Builder setBar(Object bar) {
            this.myBean.setBar(bar);
            return this;
        }
        
        public MyBean build() {
            return new MyBean(this.myBean);
        }
    }
}