1. 5
1
15
16
20
23

2. 5
array
Element)
Index)

3. 5
5.1
array 1
array
array[
array];

4. 5
5.2
int [] abc , xyz;
abc = new int[500];
xyz = new int[10];
int[] abc = new int
[500], xyz = new
int[10];
***
int [] a , b ; a
b
Array
int a[], b ; a
Array
b
Array

5. 5
1
5.3
array
{}
1
,(comma)
int a[5] = {10,20,30,40,50 } ;

6. 5
5.4
Element
Element
0
scores
Element
scores[0]
for (i=0;<9;i++)
scores[i]…;
Element

7. 5
5.5
Array
Method
Array ( Reference )
Parameter
Method

8. 5
5.6

reference
Class
Object

9. 5
 5.7
•
2
2
Row (
, Column (
2
•
2
array of array
2
array
array 1
array

10. 5
5.8
ArrayList
ArrayList
array
ArrayList
***
import
import java.util.ArrayList;

11. 5
method
,
1.add(
2.remove(
3.get(
4.indexOf(
5.
size()

12. 5
String)
5.9
Object)
Class String)
String str = new String(“Java”);
= “Java”;
2
2
String str

13. 5
5.10
String
equals( )
method
String Class
String
2

14. 5
5.11
1.
class
StringBuffer Class
3 Constructor
- StringBuffer()
String
String Class
Constructor
StringBuffer
16

15. 5
- StringBuffer(int length)
StringBuffer
length
- StringBuffer(String str)
StringBuffer
Argument “str”
str
2.
StringBuffer
StringBuilder
Thread Save