java值传递，引用传递

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1.值传递

值传递：传递的是值的拷贝,不会改变值

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1030int型值传递之后10string型值传递之前：world

2.引用传递

引用传递：传递的是值的引用

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

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