Best strategies when calling a method that needs to change more than one variable

Question

I am new to Java, I need to convert C / C ++ code to Java, and I run into obstacles. Due to the way variables are passed to methods, modifying them in a method is not simple, and I have no idea which approach is the most reasonable. Sorry for the pseudo-code examples, I hope they clearly explain what I'm talking about without going into unnecessary details.

I need something that would be equivalent to C

ModifyMyString(type1 &t1,type2 &t2);

(the return type does not matter, it may not be valid), since I need a function to change both t1 and t2.

I can easily change one of the variables, for example, t1, declaring in Java

type1 modifyMyString(type1 t1, type2 t2);    

and return value assignment

t1 = modifyMyString(t1,t2);

but this is only half the success, as the new value of t2 is lost.

I can declare a new class

class JustToPassTwoVariables {
    type1 t1;
    type2 t2;
    JustToPassTwoVariables(type1 tt1, type2 tt2) { t1 = tt1; t2 = tt2; }
}

-

JustToPassTwoVariables jtptv = modifyMyString(JustToPassTwoVariables(t1,t2));

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Answer 1

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Answer 2

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Answer 3

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:

Result result = modifyMyString(t1,t2);
result.getT1(); //gets t1 value
result.getT2(); // gets t2 value

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Answer 4

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List<String> l = new ArrayList<String>();
    l.add("Hello");
    l.add("world");
    ModifyMyString(l);
    // here also l = "hello" , "world" , "added"

    public void ModifyMyString(List l)
    {
     l.add("added"); // now l = "hello" , "world" , "added"
    }

Answer 5

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void myMethod(type1 arg0, type2 arg1) {
    arg0.setValue(newValue0);
    arg1.setValue(newValue1);
}

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class Type1Wrapper {
    private type1 type1;

    type1 getType1() {
        return type1;
    }

    void setType1(type1 newType1) {
        type1 = newType1;
    }
}

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Answer 6

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public class TypeContainer
{

  private String type1;
  private String type2;

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}

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...
public void modfiy(String val1, String val2)
{
  type1 = val1;
  type2 = val2;
}
...

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Answer 7

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public class CustomRef {
      public Object internal;

      public CustomRef(Object object) {
             this.internal=object;
      }


 }

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 CustomRef ref1= new CustomRef(myParams1);
 CustomRef ref2= new CustomRef(myParams2);

 myFunction(ref1, ref2);

 myParams1 = ref1.internal;
 myParams2 = ref2.internal;

 void myFunction(CustomRef ref1, CustomRef  ref2) {

      Object param1 = ref1.internal 
      // a lot of code
      ref1.internal = param1;

 }

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Answer 8

StringBuffer. String String