java常见的语法错误有哪些

来源:文书网 2.6W

Java语言作为静态面向对象编程语言的代表,极好地实现了面向对象理论,允许程序员以优雅的思维方式进行复杂的编程。那么java常见的.语法错误有哪些?以下仅供参考!

java常见的语法错误有哪些

具体如下:

1.变量可能未初始化

错误提示::9: variable i might not have been initialized

tln(i);

中文说明:变量i可能没有赋值就使用了。

例子说明:

int i;

tln(i);

2.变量重复定义

错误提示::9: i is already defined in main(ng[]) int i = 2;

中文说明:变量重复定义了

例子说明:int i = 1; int i = 2;

3. 找不到符号:

: cannot find symbol

symbol : variable j

location: class Test6

if(j < 0) {

4. 找不到类的错误

:4: cannot find symbol

symbol : class T1

location: class Main

T1 a = new T1();

5. 找不到方法的错误

:5: cannot find symbol

symbol : method a()

location: class T a.a();

6.找不到类

错误提示::1: class Test1 is public, should be declared in a file named public class Test1 {

中文说明:test1是公共的,必须在文件中声明

例子说明 :建一个文件为Test;在工具中打开这样写public class Test11 {}; 就会报这个错误

7 找不到这个类(类名跟文件名不一致)

NoClassDefFoundError: asa (wrong name: ASA)

8. 数组下标越界

yIndexOutOfBoundsException: 1

at 2()

at (:6)

9. 字符串下标越界

ngIndexOutOfBoundsException: String index out of range: 6

at At()

at 3()

at (:7)

10. 空指向E

xception in thread "main" PointerException

at ()

11.空返回值

错误提示:: 'void' type not allowed here

tln(it());

中文说明;此处不允许使用void返回值

例子说明:如果声明一个void的方法,那就不能直接输出来

Public static void edit() {}

tln(());

12. 缺少返回值

:8: missing return statement

int fan(){}

^

1 error

13. 没有返回值的方法中不需要返回值

: cannot return a value from method whose result type is void return a;

^

1 error

14. 引用的方法入参不对

: cannot find symbol

symbol : method createTempFile(ng,ng,ng)

location: class

File ll = teTempFile("let","java","aaa");

15. 缺少形参

del() in ice cannot be applied to (int)

16. 无效的方法声明(需要返回类型)

invalid method declaration; return type required

public byteValue(){

17. 要求传入的是数组,却传入了字符串

array required, but ng found

18 找不到构造方法

:4: cannot find symbol

symbol : constructor T()

location: class T n

ew T();

19、数字格式化异常

Exception in thread "main" erFormatException: null

20. 不兼容的类型

错误提示:: incompatible types

found : ng[]

required: []

File [] a3 = ();

中文说明:不兼容的类型

21. 非静态方法不能在静态上下文中引用

non-static method cannot be referenced from a static context

22. 不是静态方法而用静态方式调用(类名。方法)

:5: non-static method fun1() cannot be referenced from a static context

1();

23. 静态访问非静态(变量)

:5: non-static variable a cannot be referenced from a static context

a = 1000;

24. 静态访问非静态(方法)

:6: non-static method fun1() cannot be referenced from a static context

fun1(); // 静态的不能调用非静

25. continue outside of loop

(将continue放在for循环外的时候出现的错误报告)

gal start of expression

违反规则的表达(将for循环中第二表达放置于for循环外或内部时出现的错误报告)

27. :6: unreachable statement

不能到达的语句(语句放于continue或break后出现不能到达,及continue和break后不能有语句)

28 break置于循环语句外:8: break outside switch or loop

break; ^ 1 error

29- 标识符错误(标识符不合法);

热门标签