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Java不可变集合与Stream流

1 可变参数可变参数介绍可变参数又称参数个数可变，用作方法的形参出现，那么方法参数个数就是可变的了方法的参数类型已经确定,个数不确定,我们可以使用可变参数可变参数定义格式修饰符返回值类型方法名(数据类型… 变量名) { }可变参数的注意事项这里的变量其实是一个数组如果一个方法有多个参数，包含可变...

Java SE基础知识详解第[13]期—不可变集合、Stream流、异常

不可变集合、Stream流、异常1.不可变集合什么是不可变集合？不可变集合，就是不可被修改的集合。集合的数据项在创建的时候提供，并且在整个生命周期中都不可改变。否则报错。为什么要创建不可变集合？如果某个数据不能被修改，把它防御性地拷贝到不可变集合中是个很好的实践。或者当集合对象被不可信的库调用时，不...

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Java 8中处理集合的优雅姿势——Stream

在Java中，集合和数组是我们经常会用到的数据结构，需要经常对他们做增、删、改、查、聚合、统计、过滤等操作。相比之下，关系型数据库中也同样有这些操作，但是在Java 8之前，集合和数组的处理并不是很便捷。不过，这一问题在Java 8中得到了改善，Java 8 API添加了一个新的抽象称为流Stre...

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