把Java所有的关键字找出，并给出代码实例。

Java所有的关键字有：abstract、assert、boolean、break、byte、case、catch、char、class、const、continue、default、do、double、else、enum、extends、false、final、finally、float、for、goto、if、implements、import、instanceof、int、interface、long、native、new、null、package、private、protected、public、return、short、static、strictfp、super、switch、synchronized、this、throw、throws、transient、true、try、void、volatile、while。

以下是一些代码实例：

1. abstract关键字：

abstract class Animal {
public abstract void makeSound();
}

2. boolean关键字：

boolean isRaining = true;

3. break关键字：

for (int i = 0; i < 10; i++) {
if (i == 5) {
break;
}
System.out.println(i);
}

4. case关键字：

switch (dayOfWeek) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
// ...
}

5. catch关键字：

try {
// some code that may throw an exception
} catch (Exception e) {
// handle the exception
}

6. class关键字：

class Person {
private String name;
private int age;

public Person(String name, int age) {
this.name = name;
this.age = age;
}

public String getName() {
return name;
}

public int getAge() {
return age;
}
}

7. continue关键字：

for (int i = 0; i < 10; i++) {
if (i == 5) {
continue;
}
System.out.println(i);
}

8. default关键字：

switch (dayOfWeek) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
// ...
default:
System.out.println("Invalid day of week");
}

9. do关键字：

int i = 0;
do {
System.out.println(i);
i++;
} while (i < 10);

10. double关键字：

double pi = 3.14159;

11. else关键字：

if (isRaining) {
System.out.println("Bring an umbrella");
} else {
System.out.println("Leave the umbrella at home");
}

12. enum关键字：

enum DayOfWeek {
MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
}

13. extends关键字：

class Dog extends Animal {
public void makeSound() {
System.out.println("Woof!");
}
}

14. false关键字：

boolean isRaining = false;

15. final关键字：

final int MAX_VALUE = 100;

16. finally关键字：

try {
// some code that may throw an exception
} catch (Exception e) {
// handle the exception
} finally {
// code that will always execute, regardless of whether an exception was thrown or not
}

17. float关键字：

float pi = 3.14159f;

18. for关键字：

for (int i = 0; i < 10; i++) {
System.out.println(i);
}

19. if关键字：

if (isRaining) {
System.out.println("Bring an umbrella");
}

20. implements关键字：

class Dog implements Animal {
public void makeSound() {
System.out.println("Woof!");
}
}

21. import关键字：

import java.util.ArrayList;

22. instanceof关键字：

if (animal instanceof Dog) {
Dog dog = (Dog) animal;
dog.makeSound();
}

23. int关键字：

int age = 30;

24. interface关键字：

interface Animal {
void makeSound();
}

25. long关键字：

long population = 1000000000L;

26. new关键字：

Person person = new Person("Alice", 25);

27. null关键字：

String name = null;

28. package关键字：

package com.example.myapp;

29. private关键字：

private String name;

30. protected关键字：

protected int age;

31. public关键字：

public void setName(String name) {
this.name = name;
}

32. return关键字：

public int add(int a, int b) {
return a + b;
}

33. short关键字：

short temperature = 20;

34. static关键字：

static int count = 0;

35. super关键字：

class Dog extends Animal {
public void makeSound() {
super.makeSound();
System.out.println("Woof!");
}
}

36. switch关键字：

switch (dayOfWeek) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
// ...
}

37. synchronized关键字：

synchronized (lock) {
// code that needs to be executed atomically
}

38. this关键字：

public String getName() {
return this.name;
}

39. throw关键字：

if (age < 0) {
throw new IllegalArgumentException("Age cannot be negative");
}

40. throws关键字：

public void someMethod() throws IOException {
// code that may throw an IOException
}

41. try关键字：

try {
// some code that may throw an exception
} catch (Exception e) {
// handle the exception
}

42. void关键字：

public void someMethod() {
// code that does not return anything
}

43. while关键字：

int i = 0;
while (i < 10) {
System.out.println(i);
i++;
}