How to create a “Setter” in Java [duplicate]

问题

I am unsure how to create a setter method in java.
Everything that I found on the internet either shows how to "generate" one in eclipse or doesn't include what I am looking for.

I am looking for a simple answer in plain terms, if that is possible.
I understand what a setter-method does, but am unsure about the syntax and specific code.

Thank you for your time.

回答1:

A setter is a method which sets a value for one of your parameters. E.g. many people say it's not nice to have a public variable in a class:

public class SomeClass {
     public int someInt = 0;
}

now you can access the variable someInt directly:

SomeClass foo = new SomeClass();
foo.someInt = 13;

You should rather do something like that:

public class SomeClass {
    private int someInt = 0;

    // Getter
    public int getSomeInt() {
        return someInt;
    }

    // Setter
    public void setSomeInt(int someIntNew) {
        someInt = someIntNew;
    }
}

and access it through:

SomeClass foo = new SomeClass();
foo.setSomeInt(13);

All this is just convention... You could name your setter-method however you want! But getters and setters are a good (and readable) way to define access to your class varaibles as you like it (if you want to make it read-only you could just write the getter, if you don't wan't anybody to read the value you could only write the setter, you could make them protected, etc...)

回答2:

I'm assuming you mean a setter method as in set an object?

private String yourString;

public void setYourString(String yourString) {
    this.yourString = yourString;
}

This is basic code though so you probably mean something else?

Let me know.

回答3:

A small code for getter and setter

public class Test {

    String s;

    public String getS() {
        return s;
    }

    public void setS(String s) {
        this.s = s;
    }

}

Advantage of setter is that a setter can do sanity checks and throw IllegalArgumentException.

来源：https://stackoverflow.com/questions/33806159/how-to-create-a-setter-in-java

标签

java

setter