java中冒号运算符起什么作用呢?
作者:互联网
转自:
http://www.java265.com/JavaCourse/202203/2493.html
运算符简介:
运算符用于执行程序代码运算,会针对一个以上操作数项目来进行运算<br />
例:88+99,其操作数是88和99,而运算符则是“+”。在vb2005中运算符大致可以分为5种类型:算术运算符、连接运算符、关系运算符、赋值运算符和逻辑运算符。
下文笔者讲述java中冒号运算符的功能简介说明,如下所示:
冒号运算符的功能: 1.跳转 2.三元表达式 3.迭代循环 4.断言 5.switch 6.方法(jdk8)
例
1 跳出标签 label: for (int i = 0; i < x; i++) { for (int j = 0; j < i; j++) { //业务代码 } } 2 三元条件 int a = (b < 4)? 7: 8; // if b < 4, set a to 7, else set a to 8 3 每个循环 String[] ss = {"hi", "there"} for (String s: ss) { print(s); } 4 断言 int a = factorial(b); assert a >= 0: "factorial may not be less than 0"; // throws an AssertionError with the message if the condition evaluates to false 5 switch switch (type) { case WHITESPACE: case RETURN: break; case NUMBER: print("got number: " + value); break; default: print("syntax error"); } 6 方法参考 class User { public static int compareByAge(User a, User b) { return a.birthday.compareTo(b.birthday); }} } Arrays.sort(users, User::compareByAge);
标签:case,冒号,java,int,运算符,switch,User,print 来源: https://www.cnblogs.com/java265/p/16517260.html