版權(quán)聲明：本文為原創(chuàng)文章，未經(jīng)允許不得轉(zhuǎn)載。

不帶參數(shù)

第一種

public class SingleCase private constructor() {

    private object Holder { val INSTANCE = SingleCase () }

    companion object {
        val instance: SingleCase by lazy { Holder.INSTANCE }
    }
    var b:String? = null
}

第二種

public class SingleCase private constructor() {
    companion object {
        val instance: = SingleCase ()
    }
    var b:String? = null
}

第三種

public class SingleCase private constructor() {
  companion object {

            /*單例*/
            @Volatile
            private var INSTANCE: SingleCase ? = null

            /*獲取單例*/
            val instance: SingleCase 
                get() {
                    if (INSTANCE == null) {
                        synchronized(SingleCase ::class.java) {
                            if (INSTANCE == null) {
                                INSTANCE = SingleCase ()
                            }
                        }
                    }
                    return INSTANCE!!
                }
        }
}

...

帶參數(shù)

class SingleCase private constructor(str: String) {
    var string: String = str;
    companion object {
        @Volatile
        var instance: SingleCase ? = null

        fun getInstance(c: String): SingleCase {
            if (instance == null) {
                synchronized(SingleCase ::class) {
                    if (instance == null) {
                        instance = SingleCase (c)
                    }
                }
            }
            return instance!!
        }
    }
}

總結(jié)

這些也只是我在開發(fā)過程中發(fā)現(xiàn)和總結(jié)的東西，如果誰有更好的方法記得留言或者郵箱（1732685009@qq.com）

版權(quán)聲明：本文為原創(chuàng)文章，未經(jīng)允許不得轉(zhuǎn)載。