显式编码拆箱已包装的原始数值。在Java5及以上的版本，拆箱是不必要的，可以安全地删除。那么 JDK5 到底做了啥？
BigDecimal.ROUND_UNNECESSARY 翻译：舍入模式可以断言所请求的操作具有准确的结果，因此不需要舍入。...0.12345"); // 正确 System.out.println(bigDecimal1.setScale(6, BigDecimal.ROUND_UNNECESSARY...错误，需要舍入，结果不明确，抛出异常ArithmeticException System.out.println(bigDecimal2.setScale(3, BigDecimal.ROUND_UNNECESSARY
软件开发中的“心智模型”用于描述开发人员在编码时心理活动，每段代码其实是人在编写这段代码时的心智模型投射，不能把代码看成是客观的存在，而是主观的产物，参合了当时...
报错 org.mockito.exceptions.misusing.UnnecessaryStubbingException: Unnecessary stubbings detected in test...class: XXXTest Clean & maintainable test code requires zero unnecessary code....Following stubbings are unnecessary (click to navigate to relevant line of code): 1. -> at com.xxx.XXXTest.update_xxx...(XXXTest.java:125) Please remove unnecessary stubbings or use 'lenient' strictness.
unused member private int UnusedMethod() => 0; #pragma warning restore IDE0051 // IDE0079: Unnecessary...unused private members", Justification = "")] private int _unusedField; // IDE0079: Unnecessary...属性 值 选项名称 dotnet_remove_unnecessary_suppression_exclusions 选项值 , 分隔了必须从分析中排除其抑制的规则 ID 或规则类别（前缀为 category...ID 和规则类别启用规则 默认选项值 none 示例 using System.Diagnostics.CodeAnalysis; class C1 { // 'dotnet_remove_unnecessary_suppression_exclusions...= IDE0051' // Unnecessary pragma suppression, but not flagged by IDE0079 #pragma warning disable
Patterns to avoid bad performance Avoid blocking main Thread Avoid unnecessary invalidations that may...LinearLayouts ( Cz each child needs to be measured twice) Avoid Customs views not properly made Avoid Creating Unnecessary...layout (avoid extra ViewGroups on inflation) include tag (easy code reuse of common layouts) Avoid unnecessary...layouts Don’t make allocations or heavy operations in OnDraw Remove unnecessary calls to invalidate(...RecyclerView (replaces ListView and GridView) Patterns to avoid memory churn Don’t allocate a large amount of unnecessary
unnecessary_math.py: ''' 这个例子展示如何在源码中嵌入doctest用例。 '>>>' 开头的行就是doctest测试用例。 不带 '>>>' 的行就是测试用例的输出。...执行 python unnecessary_math.py 得到输出结果是： liuchunmings-MacBook-Pro:exersice liuchunming$ python unnecessary_math.py...-m doctest -v unnecessary_math.py 这里 -m 表示引用一个模块，-v 等价于 verbose=True。...将doctest测试用例从上面的python源码中剥离出来放到test_unnecessary_math.txt文件里。 这个例子展示如何将doctest用例放到一个独立的文件中。...在系统的shell中执行： python -m doctest -v test_unnecessary_math.txt add(3,4) 7
RoundingMode枚举介绍 RoundingMode舍入模式 UP CEILING FLOOR HALF_UP （Half指的中点值，例如0.5、0.05，0.15等等） HALF_DOWN UNNECESSARY...(BigDecimal.ROUND_UNNECESSARY); final int oldMode; private RoundingMode(int oldMode) {...: return UNNECESSARY; default: throw new IllegalArgumentException("...输入数字 使用 DOWN 舍入模式将输入数字舍入为一位数 5.5 6 2.5 2 1.6 2 1.1 1 1.0 1 -1.0 -1 -1.1 -1 -1.6 -2 -2.5 -2 -5.5 -6 UNNECESSARY...public final static int ROUND_UNNECESSARY = 7; 定义：用于断言请求的操作具有精确结果，因此不发生舍入。
It’s unnecessary to use a list or tuple literal within a call to set or dict....It’s unnecessary to use a list around a list comprehension, since it is equivalent without it....It’s unnecessary to use list() around sorted() as it already returns a list....It is also unnecessary to use reversed() around sorted() as the latter has a reverse argument....It’s unnecessary to use a list comprehension if the elements are unchanged.
舍入模式 ROUND_UP ROUND_DOWN ROUND_CEILING ROUND_FLOOR ROUND_HALF_UP ROUND_HALF_DOWN ROUND_HALF_EVEN ROUND_UNNECESSARY...ROUND_UNNECESSARY 断言得数为精确的结果，若不是则抛出ArithmeticException。...; System.out.println("b1结果:"+b1); System.out.println("b2结果:"+b2); 结果: b1结果:1.2 b2结果:1.2 ---- ROUND_UNNECESSARY...new BigDecimal("10"); BigDecimal one = new BigDecimal("2"); b1 = b1.divide(one, 1 ,BigDecimal.ROUND_UNNECESSARY...new BigDecimal("3"); BigDecimal one = new BigDecimal("7"); b1 = b1.divide(one, 1 ,BigDecimal.ROUND_UNNECESSARY
").setScale(0, RoundingMode.HALF_EVEN); System.out.println(bigDecimal28); 上面代码依次输出4、-4、4、-4 8）ROUND_UNNECESSARY...@code ArithmeticException} BigDecimal bigDecimal29 = new BigDecimal("1.0").setScale(0, RoundingMode.UNNECESSARY...System.out.println(bigDecimal29); BigDecimal bigDecimal30 = new BigDecimal("-1.0").setScale(0, RoundingMode.UNNECESSARY...System.out.println(bigDecimal30); BigDecimal bigDecimal31 = new BigDecimal("1.1").setScale(0, RoundingMode.UNNECESSARY...System.out.println(bigDecimal31); BigDecimal bigDecimal32 = new BigDecimal("-1.1").setScale(0, RoundingMode.UNNECESSARY
storage less than 32M, enable this when using ota //取消勾选 Global build settings ---> [*] Strip unnecessary...storage less than 32M, enable this when using ota //选中 Global build settings ---> [*] Strip unnecessary...storage less than 32M, enable this when using ota //取消勾选 Global build settings ---> [ ] Strip unnecessary...storage less than 32M, enable this when using ota //取消勾选 Global build settings ---> [ ] Strip unnecessary...by /usr/lib/libext2fs.so.2) 关闭以下选项： make menuconfig | --- Global build settings | --- []strip unnecessary
issues Coming back to the problems that we can find on the CPU side, the most common one comes from unnecessary...All this CPU and GPU extra time that we are spending drawing unnecessary layouts, redrawing views (if...The overdraw appears as a result of applying unnecessary backgrounds to ours Views.
In addition to * unnecessary resources (such as memory and instances of codecs) * being held...instances * of the same codec are supported, some performance degradation * may be expected when unnecessary
+ "使用 银行家舍入法（ROUND_HALF_EVEN）方式四舍五入结果为：" + f6); System.out.println(f + "使用 不需要舍入模式（ROUND_UNNECESSARY...(8).ROUND_UNNECESSARY:计算结果是精确的，不需要舍入模式。...解释 ROUND_UNNECESSARY方式表示计算结果是精确的，如果不是精确的，将会抛出java.lang.ArithmeticException异常。...).doubleValue(); System.out.println("ROUND_UNNECESSARY方式处理后：" + f7); } 如果将BigDecimal b7...也就是说，使用ROUND_UNNECESSARY方式时，浮点数保留N位小数时，不能影响数字的精度，只要有舍弃掉数字导致精度受影响，都会抛出异常。
// 3.4 System.out.println(num.setScale(2, BigDecimal.ROUND_HALF_EVEN)); // 3.37 八、BigDecimal.ROUND_UNNECESSARY...= new BigDecimal("3.37459"); // 断言请求的操作具有精确的结果 System.out.println(num.setScale(5, BigDecimal.ROUND_UNNECESSARY...)); // 3.37459 System.out.println(num.setScale(2, BigDecimal.ROUND_UNNECESSARY)); // 抛出 ArithmeticException
建议主动通过命名差异来解决这个问题 不建议压制警告 Uncessary cases (不必要的编码场景) UNNECESSARY_SAFE_CALL(不必要的安全调用) fun testUnnecessarySafeCall...(message: String) { @Suppress("UNNECESSARY_SAFE_CALL") println(message?....= null) { } } 和前面的例子一样，这种检查是多余的，因为Kotlin内部会有Intrinsics做参数非空的与判断 建议主动移除无意义的比较 不建议压制警告 UNNECESSARY_NOT_NULL_ASSERTION...（不需要的非空断言） fun testUncessaryNotNullAssertion(message: String) { //Unnecessary non-null assertion...on a non-null receiver // of type String @Suppress("UNNECESSARY_NOT_NULL_ASSERTION") println
MDX transpiles markdown to JSX render functions, which is terribly inefficient (double payload cost + unnecessary...automatically strips all static parts of your markdown from the compiled JavaScript so there is no unnecessary
文章作者：Tyan 博客：noahsnail.com | CSDN | 简书 Item 5: Avoid creating unnecessary objects It is often appropriate...You can often avoid creating unnecessary objects by using static factory methods (Item 1) in preference...public boolean isBabyBoomer() { // Unnecessary allocation of expensive object Calendar...It would be possible to eliminate the unnecessary initializations by lazily initializing these fields...There’s a new way to create unnecessary objects in release 1.5.
Too many of them can be unnecessary, while chaining all commands into one RUN instruction can bust the...Tip #4: Remove unnecessary dependencies Remove unnecessary dependencies and do not install debugging
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