方法的调用的回顾

package oop;
​
public class Demo02 {//静态public static void main(String[] args) {//student student = new student();student.speak();//非静态
//student student = new student();}
}

package oop;
​
public class student {public static void speak() {System.out.println("说话");}
}

package oop;
​
public class Demo03 {public static void main(String[] args) {int a = 1;System.out.println(a);//1Demo03.change(a);
​System.out.println(a);//1}//返回值为空public static void change(int a) {a=10;}
}

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