> db.inventory.distinct(“item.sku”)//获取item子字段sku的不重复值 结果:[“111”,”222”,”333”] >db.inventory.distinct(“sizes”)//获取数组格式字段的不重复值 结果:[“M”,”S”,”L”] >db.inventory.distinct(“item.sku”,{dept:”A”})//满足dept为A数据的item字段的子字段的不重复...
/** * Throw in Java */ public class ThrowExample { void checkAge(int age) { if (age < 18) throw new ArithmeticException("Not Eligible for voting"); else System.out.println("Eligible for voting"); } public static void main(String args[]) { ThrowExample obj = new ThrowExample(); ...
publicclassExample1{voidcheckAge(intage){if(age<18)thrownewArithmeticException("Not Eligible for voting");elseSystem.out.println("Eligible for voting");}publicstaticvoidmain(Stringargs[]){Example1obj=newExample1();obj.checkAge(13);System.out.println("End Of Program");}} Output: Exceptioninth...
booleanisEligibleToVote(Object obj){ if(obj instanceofPerson(String name, int age)){ returnage>=18; } returnfalse; } In the preceding code, the record patternPerson(String name, int age)only seems to enable using the variableageinstead ofperson.age(). However, as you’ll read this blog...
Age Verification: They help determine if a user is eligible for certain actions, such as voting, driving, or accessing age-restricted content. Even or Odd Number Check: By using an if-else statement, a program can check whether a number is even or odd and execute the corresponding logic. ...
Beta versions were not eligible. A panel of nine judges, all of them JavaWorld authors, voted in several rounds to narrow the more than 100 nominations to three finalists in each category. The panel then went through yet another round of voting to choose the winners. In making their final...
2. Class(Method) Area: Class(Method) Area stores per-class structures such as the runtime constant pool, field and method data, the code for methods. 3. Heap: It is the runtime data area in which objects are allocated. 4. Stack: Java Stack stores frames.It holds local variables and ...
out.println("Eligible for voting"); } public static void main(String args[]) { ThrowExample obj = new ThrowExample(); obj.checkAge(13); System.out.println("End Of Program"); } } Output Exception in thread "main" java.lang.ArithmeticException: Not Eligible for voting at Example1.check...
public class ThrowExample { void checkAge(int age) { if(age < 18) throw new ArithmeticException("Not Eligible for voting"); else System.out.println("Eligible for voting"); } public static void main(String args[]) { ThrowExample obj = new ThrowExample(); obj.checkAge(13); System.out...
The Factory Method is usually categorised by a switch statement where each case returns a different class, using the same root interface so that the calling code never needs to make decisions about the implementation. Example:credit card validator factory which returns a different validator for each...