java - How to use a lambda expression to pass a method as a parameter when calling another method? -

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Say I have two ways different from zero fee (integer zodiac, difference account) and Zero ChargeCompany (int sum, int account) . Say I have another method which is called zero processale (string item, customer C) . What can I do, I can either pass in-charge person or chargeToCompany as the argument for the processSale and I can How do I call? 

  if (IG (some customers)) {PROCESSIAL (one item, some customer, charge to individual)} and If (iCompany (some customers)) {processSale (anItem, some customer, charge, customer)}   
 and inside  processSale ()  how will i actually call  chargout person  or  chargeToCustomer () ?   
 
 
 You have two functions:  
  zero charge (Int amount , Int accounts); Zero Incharge Companie (integer amount, int account);   
 What is their likeness that they take both the two  int  parameters and do back  zero . There is no functional interface in  java.util.function  that matches this size but it is easy to define ourselves:  
  interface IntIntConsumer {zero acceptance (Int sum, int accounts); }   
 You can re-type the calling code as follows:  
  if (that is, some person (some customers)) {processSale (anItem, SomeCustomer, MyClass :: chargeToIndividual); } Else if (isCompany (some customers)) {processSale (anItem, SomeCustomer, MyClass :: chargToCompany); } Else {...}   
 Or if  fee-to-Indies  and  in-charge customers  are examples of ways, probably < Code> This :: Chargedondivative  and  This :: Charged customer . Alternatively, the charging function must be stored in a local variable. After this you will have to make a call at  processSale :  
  IntIntConsumer chargeFunc; If (IIG (some customers)) {chargeFunc = it :: Chargedindiv; } Else if (isCompany (some customers)) {chargeFunc = this :: chargeToCompany; } And {...} with the process (one item, some customers, duty functions);   
 The call to the charging function will now look like this:  
  zero process all (item items, customer customer, IntIntConsumer func ) {... func.accept (item.getAmount (), customer.getAccount ()); ...}   
 Of course I have made some assumptions, from where the  amount  and  account  are found, but I think you Can get ideas.

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