Java中的equals是十分重要的,和= =要区别开来, = =和 equals 1、声明格式 public boolean equals(Object obj) 1. 其比较规则为:当参数obj引用的对象与当前对象为同一个对象时,就返回true,否则返回false. 比如以下两个对象animal1和animal2,引用不同的对象,因此用==或equals()方法比较的
importjava.util.Scanner;publicclassLoginExample{publicstaticvoidmain(String[]args){Scannerscanner=newScanner(System.in);StringcorrectPassword="password123";System.out.print("Enter password: ");StringuserInput=scanner.nextLine();booleanisPasswordCorrect=userInput.equals(correctPassword);if(isPasswordCorrect)...
hashCodein classObject Returns: the integer1231if this object representstrue; returns the integer1237if this object representsfalse. See Also: Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object) hashCode public static int hashCode(boolean value) ...
Boolean源码比较简单。 1publicfinalclassBooleanimplementsjava.io.Serializable,2Comparable<Boolean>3{4/**5* The {@codeBoolean} object corresponding to the primitive6* value {@codetrue}.7*/8publicstaticfinalBoolean TRUE =newBoolean(true);910/**11* The {@codeBoolean} object corresponding to the pr...
if (male == true) { name = "Robert"; } If the boolean variable male equals to true, we set the name variable to "Robert". Theifkeyword works with boolean values. if (male == false) { name = "Victoria"; } If the random generator chooses false than we set the name variable to...
Equals(Object) Indicates whether some other object is "equal to" this one. (Inherited from Object) GetHashCode() Returns a hash code value for the object. (Inherited from Object) JavaFinalize() Called by the garbage collector on an object when garbage collection determines that there ...
Methods inherited from java.lang.Objectclone equals finalize getClass hashCode notify notifyAll toString wait wait wait Constructor Details WorkspaceCustomBooleanParameter public WorkspaceCustomBooleanParameter() Creates an instance of WorkspaceCustomBooleanParameter class....
Boolean b=getBoolean();if(Boolean.TRUE.equals(b)) { foo(); }else{ bar();//will be invoked for both b == false and b == null} See* Java Language Specification §5.1.8 Unboxing Conversion 6、 Minor code smell Removethisuse of "Integer";it is deprecated. ...
FATALEXCEPTION:mainProcess:com.lwp.justtest,PID:6054java.lang.RuntimeException:Unable to start activity ComponentInfo{com.lwp.justtest/com.lwp.justtest.MainActivity}:android.view.InflateException:BinaryXMLfile line #19:Attempt to invoke virtual method'boolean java.lang.String.equals(java.lang.Object)...
Process:com.lwp.justtest,PID:6054java.lang.RuntimeException:Unabletostart activity ComponentInfo{com.lwp.justtest/com.lwp.justtest.MainActivity}:android.view.InflateException:Binary XML file line #19:Attempttoinvoke virtual method'boolean java.lang.String.equals(java.lang.Object)'on anullobjectreferen...