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利用ToStringBuilder 重寫POJO中的toString

廢話少說，直接上代碼，感覺還是比較有用，貌似發現還有很多人在重寫POJO的toString方法時，自己拼那些POJO屬性，這個體力活還是由于ToStringBuilder來做吧。

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

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

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

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

public class MainClass {

public static void main(String[] args) {

MyClass one = new MyClass("Becker", 35);

MyClass two = new MyClass("Becker", 35);

MyClass three = new MyClass("Agassi", 33);

System.out.println("One>>>" + one);

System.out.println("Two>>>" + two);

System.out.println("Three>>>" + three);

System.out.println("one equals two? " + one.equals(two));

System.out.println("one equals three? " + one.equals(three));

System.out.println("One HashCode>>> " + one.hashCode());

System.out.println("Two HashCode>>> " + two.hashCode());

System.out.println("Three HashCode>>> " + three.hashCode());

}

class MyClass {

private String name = null;

private int age = 0;

public MyClass(String name, int age) {

this.name = name;

this.age = age;

}

public boolean equals(Object obj) {

return EqualsBuilder.reflectionEquals(this, obj);

}

public String toString() {

return ToStringBuilder.reflectionToString(this,

ToStringStyle.MULTI_LINE_STYLE);

}

public int hashCode() {

return HashCodeBuilder.reflectionHashCode(this);

}

輸出的結果如下：

One>>>MyClass@743399[
            name=Becker
            age=35
            ]
            Two>>>MyClass@1d8957f[
            name=Becker
            age=35
            ]
            Three>>>MyClass@3ee284[
            name=Agassi
            age=33
            ]
            one equals two? true
            one equals three? false
            One HashCode>>> 462213092
            Two HashCode>>> 462213092
            Three HashCode>>> -530629296