equalsbuilder 示例

1.判断是否为空(null),是则false

2.判断是否为同一类型(instanceof),否则false

3.判断是否为同一对象(==),是则true,否则执行EqualsBuilder   


Java代码
package com.iwindyforest.eb;  
 
import org.apache.commons.lang.builder.EqualsBuilder;  
 
public class User  
{  
    int id;  
    String name;  
    String sex;  
    int age;  
    String address;  
 
    public User(int id, String name, String sex, int age, String address)  
    {  
        this.id = id;  
        this.name = name;  
        this.sex = sex;  
        this.age = age;  
        this.address = address;  
    }  
 
    public int getId()  
    {  
        return id;  
    }  
 
    public void setId(int id)  
    {  
        this.id = id;  
    }  
 
    public String getName()  
    {  
        return name;  
    }  
 
    public void setName(String name)  
    {  
        this.name = name;  
    }  
 
    public String getSex()  
    {  
        return sex;  
    }  
 
    public void setSex(String sex)  
    {  
        this.sex = sex;  
    }  
 
 
 
    public int getAge()  
    {  
        return age;  
    }  
 
 
 
    public void setAge(int age)  
    {  
        this.age = age;  
    }  
 
 
 
    public String getAddress()  
    {  
        return address;  
    }  
 
 
 
    public void setAddress(String address)  
    {  
        this.address = address;  
    }  
 
 
 
    public boolean equals(User user)  
    {  
        if(user == null)  
        {  
            return false;  
        }  
 
        if(!(user instanceof User))  
        {  
            return false;  
        }  
 
        if(this == user)  
        {  
            return true;  
        }  
        else 
        {  
            return new EqualsBuilder()  
                         .append(this.getId(), user.getId())  
                         .append(this.getAddress(), user.getAddress())  
                         .append(this.getAge(), user.getAge())  
                         .append(this.getName(), user.getName())  
                         .append(this.getSex(), user.getSex)).isEquals();  
        }  
    }  
} 

package com.iwindyforest.eb;

import org.apache.commons.lang.builder.EqualsBuilder;

public class User
{
    int id;
    String name;
    String sex;
    int age;
    String address;

    public User(int id, String name, String sex, int age, String address)
    {
        this.id = id;
        this.name = name;
        this.sex = sex;
        this.age = age;
        this.address = address;
    }

    public int getId()
    {
        return id;
    }

    public void setId(int id)
    {
        this.id = id;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public String getSex()
    {
        return sex;
    }

    public void setSex(String sex)
    {
        this.sex = sex;
    }



    public int getAge()
    {
        return age;
    }



    public void setAge(int age)
    {
        this.age = age;
    }



    public String getAddress()
    {
        return address;
    }



    public void setAddress(String address)
    {
        this.address = address;
    }



    public boolean equals(User user)
    {
        if(user == null)
        {
            return false;
        }

        if(!(user instanceof User))
        {
            return false;
        }

        if(this == user)
        {
            return true;
        }
        else
        {
            return new EqualsBuilder()
                         .append(this.getId(), user.getId())
                         .append(this.getAddress(), user.getAddress())
                         .append(this.getAge(), user.getAge())
                         .append(this.getName(), user.getName())
                         .append(this.getSex(), user.getSex)).isEquals();
        }
    }
}

   


Java代码
package com.iwindyforest.eb;  
 
public class EqualsBuilderTest  
{  
    User a, b;  
 
    public EqualsBuilderTest()  
    {  
 
        a = new User(1, "cyh", "male", 20, "shangdi haidian beijing");  
        b = new User(1, "cyh", "male", 20, "shangdi haidian beijing");  
        System.out.println(a.equals(null));  
        System.out.println(a.equals(new User(2, "cyh", "male", 20,  
        "shangdi haidian beijing")));  
        System.out.println(a.equals(b));  
    }  
 
    public static void main(String[] args)  
    {  
       new EqualsBuilderTest();  
    }  
}