多项选择题Which of the following statements are legal?()         

A. long l = 4990;
B. int i = 4L;
C. float f = 1.1;
D. double d = 34.4;
E. double t = 0.9F;


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1.多项选择题

String s= "hello";    
String t = "hello"; 
char c[] = {’h’,’e’,’l’,’l’,’o’} ;    
Which return true?()   

A. s.equals(t);
B. t.equals(c);
C. s==t;
D. t.equals(new String("hello"));
E. t==c;

2.单项选择题Which expressions are correct to declare an array of 10 String objects? ()   

A. char str[];
B. char str[][];
C. String str[];
D. String str[10];

3.单项选择题A public member vairable called MAX_LENGTH which is int type, the value of the variable remains constant value 100. Use a short statement to define the variable.()   

A. public int MAX_LENGTH=100;
B. final int MAX_LENGTH=100;
C. final public int MAX_LENGTH=100;
D. public final int MAX_LENGTH=100;

5.多项选择题

public class Parent { 
public int addValue( int a, int b) {    
int s;    
s = a+b;    
return s;    
}    
} 
class Child extends Parent { 
} 
Which methods can be added into class Child?()   

A. int addValue( int a, int b ){// do something...}
B. public void addValue (){// do something...}
C. public int addValue( int a ){// do something...}
D. public int addValue( int a, int b )throws MyException {//do something...}

6.单项选择题

Given the following code:   
 public class Person{    
int arr[] = new int[10]; 
public static void main(String a[]) {    
System.out.println(arr[1]);   
 }    
} 
Which statement is correct?() 

A. When compilation some error will occur.
B. It is correct when compilation but will cause error when running.
C. The output is zero.
D. The output is null.

7.单项选择题

Given the following code:    
public class Person{ static int arr[] = new int[10]; 
public static void main(String a[]) {    
System.out.println(arr[1];)    
}    
}
 Which statement is correct?()   

A. When compilation some error will occur.
B. It is correct when compilation but will cause error when running.
C. The output is zero.
D. The output is null.

8.多项选择题Which statements about Java code security are true?() 

A. The bytecode verifier loads all classes needed for the execution of a program.
B. Executing code is performed by the runtime interpreter.
C. At runtime the bytecodes are loaded, checked and run in an interpreter.
D. The class loader adds security by separating the namespaces for the classes of the local file system from those imported from network sources.