自定义字符串拼接类

public class MyStringBuilder  {

    private StringBuilder sb;

    public MyStringBuilder(){
        sb = new StringBuilder();
    }

    /**
     * 添加数据值
     * @param obj
     * @return
     */
    public MyStringBuilder append(Object obj) {
        return append(String.valueOf(obj));
    }

    /**
     * 添加数据并换行
     * @param obj
     * @return
     */
    public MyStringBuilder appendLine(Object obj) {
        return appendLine(String.valueOf(obj));
    }

    private MyStringBuilder append(String str)
    {
        sb.append(str != null ? str :"");
        return this;
    }

    private MyStringBuilder appendLine(String str)
    {
        sb.append(" ").append(str != null ? str :"").append(System.getProperty("line.separator"));
        return this;
    }

    public String toString()
    {
        return sb.toString();
    }
}