java简单代码样例

当提到"简单的Java代码样例"时，具体的示例可能涉及各种不同的主题。

Hello World：

java
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

变量和数据类型：

java
public class VariableExample {
    public static void main(String[] args) {
        int num1 = 5;
        double num2 = 3.14;
        String text = "Hello";

        System.out.println("Number 1: " + num1);
        System.out.println("Number 2: " + num2);
        System.out.println("Text: " + text);
    }
}

条件语句：

java
public class ConditionalExample {
    public static void main(String[] args) {
        int x = 10;

        if (x > 0) {
            System.out.println("Positive number");
        } else if (x < 0) {
            System.out.println("Negative number");
        } else {
            System.out.println("Zero");
        }
    }
}

循环语句：

java
public class LoopExample {
    public static void main(String[] args) {
        for (int i = 1; i <= 5; i++) {
            System.out.println("Iteration " + i);
        }
    }
}

数组：

java
public class ArrayExample {
    public static void main(String[] args) {
        int[] numbers = {1, 2, 3, 4, 5};

        for (int i = 0; i < numbers.length; i++) {
            System.out.println("Element " + i + ": " + numbers[i]);
        }
    }
}

方法：

java
public class MethodExample {
    public static void main(String[] args) {
        int result = addNumbers(3, 7);
        System.out.println("Sum: " + result);
    }

    static int addNumbers(int a, int b) {
        return a + b;
    }
}

类和对象：

java
public class Dog {
    String name;
    int age;

    // 构造方法
    public Dog(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // 方法
    public void bark() {
        System.out.println("Woof, woof!");
    }

    public static void main(String[] args) {
        Dog myDog = new Dog("Buddy", 3);
        System.out.println("Dog's name: " + myDog.name);
        System.out.println("Dog's age: " + myDog.age);
        myDog.bark();
    }
}

异常处理：

java
import java.util.Scanner;

public class ExceptionHandling {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        try {
            System.out.print("Enter a number: ");
            int number = scanner.nextInt();
            System.out.println("You entered: " + number);
        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        } finally {
            scanner.close();
        }
    }
}

集合：

java
import java.util.ArrayList;
import java.util.List;

public class ListExample {
    public static void main(String[] args) {
        List<String> fruits = new ArrayList<>();
        fruits.add("Apple");
        fruits.add("Banana");
        fruits.add("Orange");

        for (String fruit : fruits) {
            System.out.println(fruit);
        }
    }
}

线程：

java
public class ThreadExample {
    public static void main(String[] args) {
        Thread myThread = new Thread(() -> {
            for (int i = 1; i <= 5; i++) {
                System.out.println("Count: " + i);
                try {
                    Thread.sleep(1000); // 暂停1秒
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });

        myThread.start();
    }
}