也就是说,在Objective-C下面,即便str1为nil,也不会造成程序崩溃,而是会继续运行。 那么当str1为空的时候,[str1 compare:@"some text"] 消息的返回就会为nil。nil表示一个空的Objective-C对象,实际就是表示一个空指针,而它代表的值就是0,与NSOrderedSame的值相等. 如此,回到最前面的if语句,如果
using System; using System.Collections; using System.Globalization; public class SamplesComparer { public static void Main() { // Creates the strings to compare. String str1 = "llegar"; String str2 = "lugar"; Console.WriteLine( "Comparing \"{0}\" and \"{1}\" ..."...
using System; using System.Collections; public class Temperature : IComparable { // The temperature value protected double temperatureF; public int CompareTo(object obj) { if (obj == null) return 1; Temperature otherTemperature = obj as Temperature; if (otherTemperature != null) return this....
) { Console.Write("{0,10}: ", title); StringBuilder sb = new StringBuilder(); foreach (string s in myList) { sb.AppendFormat("{0}, ", s); } sb.Remove(sb.Length - 2, 2); Console.WriteLine(sb); } } public class ReverseStringComparer : IComparer { public int Compare(object?
allowEmptybooleanwhether the attribute value can be null or empty.CCompareValidator attributesarraylist of attributes to be validated.CValidator builtInValidatorsarraylist of built-in validators (name=>class)CValidator compareAttributestringthe name of the attribute to be compared withCCompareValidator ...
letkeys: [String:AnyClass]=["modify_time":NSDate.self,"schedule_time":NSDate.self,"status":NSString.self] for(key, value)inkeys { print("OLD:\(key)old=\(oldInfo[key])new=\(info[key])") guard letold=oldInfo[key]where(oldas!NSObject).isKindOfClass(value), ...
is returned after adding a where-object filter. "Get-EventLog: Attempted to perform an unauthorized operation" - why?? "Get-WmiObject not supported" when using WmiMonitorID class "make sure that the assembly containing this type is loaded" disagnostic "Register this connection's addresses in ...
public class LockSupport { public static void unpark(Thread thread) { if (thread != null) unsafe.unpark(thread); } 1. 2. 3. 4. 5. public static void park(Object blocker) { Thread t = Thread.currentThread(); setBlocker(t, blocker); ...
It compares the binary value of each Char object in two strings. As a result, the default ordinal comparison is also case-sensitive.The test for equality with String.Equals and the == and != operators differs from string comparison using the String.CompareTo and Compare(String, String) ...
using System; using System.Collections; public class Temperature : IComparable { // The temperature value protected double temperatureF; public int CompareTo(object obj) { if (obj == null) return 1; Temperature otherTemperature = obj as Temperature; if (otherTemperature != null) return this....