java值传递，引用传递

1.值传递

public class ValueTransmit {
public static void main(String[] s){
ValueTransmit value = new ValueTransmit();
int number = 10;
System.out.println("int型值传递之前"+number);
value.valueTest(number);
System.out.println("int型值传递之后"+number);

String string = "world";
System.out.println("string型值传递之前："+string);
value.valueTest(string);
System.out.println("string型值传递之后"+string);
}
public void valueTest(int number){
number = 30;
System.out.println(number);
}
public void valueTest(String str){
str = "hello";
System.out.println(str);
}
}

结果：
int型值传递之前10
30
int型值传递之后10
string型值传递之前：world

2.引用传递

public class QuoteTransmit {
public static void main(String[] args){

QuoteTransmit quoteTransmit = new QuoteTransmit();
Student student = new Student();
System.out.println("刚初始化：age:"+student.age+"\tname:"+student.name);

student.age = 30;
student.name = "hellor";
System.out.println("引用传递之前：年龄="+student.age);
System.out.println("引用传递之前：姓名="+student.name);

quoteTransmit.quoteTest(student);
System.out.println("引用传递之后：年龄="+student.age);
System.out.println("引用传递之后：姓名="+student.name);

}
public void quoteTest(Student student){
student.age = 20;
student.name = "siyu";
}

}
class Student{
int age = 10;
String name = "ruhua";
}

结果：
刚初始化：age:10 name:ruhua
引用传递之前：年龄=30
引用传递之前：姓名=hellor
引用传递之后：年龄=20
引用传递知乎：姓名=siyu