Java でよくある構文エラー

Abc.java:9: variable i might not have been initialized
                System.out.println(i);

int i;
System.out.println(i);

Abc.java:9: i is already defined in main(java.lang.String[])
                int i = 2;

 int i = 1;
 int i = 2;

Test6.java:26: cannot find symbol
symbol  : variable j
location: class Test6
   if(j < 0) {

Main.java:4: cannot find symbol
symbol  : class T1
location: class Main
  T1 a = new T1();

Main.java:5: cannot find symbol
symbol  : method a()
location: class T
  a.a();

Test.java:1: class Test1 is public, should be declared in a file named Test1.java
public class Test1 {

NoClassDefFoundError: asa (wrong name: ASA)

java.lang.ArrayIndexOutOfBoundsException: 1
        at Test2.test2(Test2.java:30)
        at Test2.main(Test2.java:6)

java.lang.StringIndexOutOfBoundsException: String index out of range: 6
        at java.lang.String.charAt(String.java:558)
        at Test2.test3(Test2.java:41)
        at Test2.main(Test2.java:7)

Exception in thread "main" java.lang.NullPointerException
        at Next.main(Next.java:31)

 Test1.java:54: 'void' type not allowed here
   System.out.println(a5.deleteOnExit());

  Public static void edit() {}
System.out.println(Test.edit());

asa.java:8: missing return statement
 int fan(){}
                  ^
1 error

asa.java:10: cannot return a value from method whose result type is void
   return a;
                        ^
1 error

Next.java:66: cannot find symbol
symbol  : method createTempFile(java.lang.String,java.lang.String,java.lang.String)
location: class java.io.File
   File ll = f.createTempFile("let","java","aaa");

 del() in sms.service.Service cannot be applied to (int)

invalid method declaration; return type required
        public byteValue(){

array required, but java.lang.String found
                    ^

Main.java:4: cannot find symbol
symbol  : constructor T()
location: class T
  new T();

Exception in thread "main" java.lang.NumberFormatException: null 20. .不兼容的类型
错误提示Test1.java:41: incompatible types
found   : java.lang.String[]
required: java.io.File[]
 File [] a3 = a11.list()；
中文说明 不兼容的类型

non-static method cannot be referenced from a static context

Main.java:5: non-static method fun1() cannot be referenced from a static context
                Test.fun1();

Test.java:5: non-static variable a cannot be referenced from a static context
                a = 1000;

Test.java:6: non-static method fun1() cannot be referenced from a static context
            fun1();                    // 静态的不能调用非静

asa.java:8: break outside switch or loop
 break;
        ^
1 error

asa.java:2: <identifier> expected
 int %%;
            ^
1 error

MyAbstract.java:1: MyAdstract is not abstract and does not override abstract method fun1() in MyAdstract

Main.java:6: Myabstract is abstract; cannot be instantiated

MyInterface.java:2: interface methods cannot have body

Myabstract is abstract; cannot be instantiated

interface methods cannot have body

asa.java:3: modifier static not allowed here
 public static void main(String []args){
     ^    ^

asa.java:4: inconvertible types
found   : java.lang.String
required: int
  int b=(int)a;
                           ^
1 error

asa.java:5: ';' expected

asa.java:8: '}' expected

 java.lang.NegativeArraySizeException

java.lang.ArithmeticException: / by zero
        at Test2.test(Test2.java:16)
        at Test2.main(Test2.java:5)