1.The SET method & GET method

We can use SET method to set value for a private member in a class.

Here it shows the advantages of SET method

1. It's a indirect access,but it can make a judgement for the passed values

public class Person {
    private String name;
    // The set method
    public void setName(String name){
        //for security,we can add some conditions to constraint its range of application
        if(name.length() == 8) {
            //this.name means it indicates the value that users pass through setNmae(String name)
            this.name = name;
        }
    }
}

The GET method

public String getName(){
        return name;
        //There is no need to use this.name for it's unambiguous
    }

2.toString method