lombok：通過註解方式減少POJO類的getter和setter等方法來消除冗餘程式碼量

安裝
1.下載 lombok.jar
2.官網說是可以雙擊安裝，，，我用這種方法不可行
2.手動安裝
（1）將lombok.jar移到eclipse的安裝目錄

（2）在eclipse.in檔案最後加入下面兩行

-Xbootclasspath/a:lombok.jar
-javaagent:lombok.jar

=============
-javaagent:xxx.jar 的jar名稱 需要與根目錄下的jar名一致，
不一致，可能會出現eclipse無法啟動的情況。

（3）重啟eclipse，進行程式碼測試

原始java程式碼：

public class NoteTest {

    private int noteId;
    private String title;
    private String content;
    private int typeId;

}

class檔案反編譯後：

public class NoteTest
{

    private int noteId;
    private String title;
    private String content;
    private int typeId;

    public NoteTest
 
()
    {

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加入lombok註解後的java程式碼：

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString(exclude="typeId")
public class NoteTest {

    private int noteId;
    private String title;
    private String content;
    private int typeId;

}

加註解，經反編譯：

public class NoteTest
 

{

    private int noteId;
    private String title;
    private String content;
    private int typeId;

    public int getNoteId()
    {
        return noteId;
    }

    public String getTitle()
    {
        return title;
    }

    public String getContent()
    {
        return content;
    }

    public int getTypeId()
    {
        return typeId;
    }

    public void setNoteId(int noteId)
    {
        this.noteId = noteId;
    }

    public void setTitle(String title)
    {
        this.title = title;
    }

    public void setContent(String content)
    {
        this.content = content;
    }

    public void setTypeId(int typeId)
    {
        this.typeId = typeId;
    }

    public boolean equals(Object o)
    {
        if (o == this)
            return true;
        if (!(o instanceof NoteTest))
            return false;
        NoteTest other = (NoteTest)o;
        if (!other.canEqual(this))
            return false;
        if (getNoteId() != other.getNoteId())
            return false;
        Object this$title = getTitle();
        Object other$title = other.getTitle();
        if (this$title != null ? !this$title.equals(other$title) : other$title != null)
            return false;
        Object this$content = getContent();
        Object other$content = other.getContent();
        if (this$content != null ? !this$content.equals(other$content) : other$content != null)
            return false;
        return getTypeId() == other.getTypeId();
    }

    protected boolean canEqual(Object other)
    {
        return other instanceof NoteTest;
    }

    public int hashCode()
    {
        int PRIME = 59;
        int result = 1;
        result = result * 59 + getNoteId();
        Object $title = getTitle();
        result = result * 59 + ($title != null ? $title.hashCode() : 43);
        Object $content = getContent();
        result = result * 59 + ($content != null ? $content.hashCode() : 43);
        result = result * 59 + getTypeId();
        return result;
    }

    public NoteTest()
    {
    }

    public NoteTest(int noteId, String title, String content, int typeId)
    {
        this.noteId = noteId;
        this.title = title;
        this.content = content;
        this.typeId = typeId;
    }

    public String toString()
    {
        return (new StringBuilder("NoteTest(noteId=")).append(getNoteId()).append(", title=").append(getTitle()).append(", content=").append(getContent()).append(")").toString();
    }
}