review

Scope

By Arasaka Teacher

​class outputting{ static Integer data = l; public static void outputData() { System.out.println(data); } public static void main(String args[]) { System.out.println(data); outputData();}

​public class Student { // 全局变量（成员变量） String name; // 保存学生的名字，整个类中都可以使用 // 方法，带有参数
public void sayHello(String greeting) {
// 参数变量：greeting //
局部变量：message

String message = greeting + ", " + name;
System.out.println(message); // 输出：Hello, 小明 }
public static void main(String[] args) {
Student stu = new Student();
stu.name = "小明"; // 设置全局变量 stu.sayHello("Hello"); // 传入参数变量 } }

Drag and Drop

public class Dog {

​

Placeholder

String name;

​

Placeholder

public void bark(int times) {

​

Placeholder

String sound = "Woof";

for (int i = 0; i < times; i++) {

System.out.println(name + ": " + sound);

}

}

public static void main(String[] args) {

Dog d = new Dog();

d.name = "Xiao Hei"; ​

Placeholder

d.bark(3); ​

Placeholder

}

}

Drag these tiles and drop them in the correct blank above

// This is a global variable

// A method with a parameter

// This is a local variable

// Set the global variable

// Call the method, pass in the parameter

Dropdown

public class Counter {

​

Select answer

int totalCount = 0;

public void addCount(int number) {

​

Select answer

int added = number * 2;

totalCount += added;

System.out.println("Added: " + added);

System.out.println("Total: " + totalCount);

}

public static void main(String[] args) {

Counter c = new Counter();

c.addCount(5);

}

}

Fill in the Blank

public class MathTool {

// 方法一：打印两数相加结果

public void printSum(int a, int b) {

int sum = a + b;

System.out.println("Sum is: " + sum);

}

// 方法二：返回两数之和

public int getSum(int a, int b) {

return a + b;

}

public static void main(String[] args) {

MathTool tool = new MathTool();

tool.printSum(3, 4); // 调用方法一

int result = tool.getSum(5, 6); // 调用方法二

System.out.println(result); // 打印返回值

}

}

Method printSum is a __________ (Procedure / Function)

Method getSum is a __________ (Procedure / Function)

Labelling

label

Drag labels to their correct position on the image

Yes, must use return to give back a valu

getSum()

Performs an action (e.g., print)

No (nothing to assign)

Has a return value (int, String, etc.)

No return value (void)

Calculates and returns a result