CLASS AND METHODS
import java.io.*;
class simple
{
int r=5;
void cal()
{
double area=3.14*r*r;
System.out.println("Area
of the circle:"+area);
}
public void
main(String arg[])
{
simple s=new
simple();
s.cal();
}
}
Sum of the
Digits
import java.io.*;
class sum
{
void disp()throws
IOException
{
int n,r,s;
DataInputStream
in=new DataInputStream(System.in);
System.out.println(“Enter
the Number=”);
n=Integer.parseInt(in.readLine());
s=0;
while(n!=0)
{
r=n%10;
s=s+r;
n=n/10;
}
System.out.println(“Sum
of the Digit is =”+s);
}
}
class ssum
{
public static void
main (String arg[] )throws IOException
{
sum s1=new sum();
s1.disp();
}
}
Armstrong
No Checking
import java.io.*;
class arms
{
DataInputStream
in=new DataInputStream(System.in);
arms()throws
IOException
{
int n,r,s,t;
System.out.println("Enter
the Number=");
n=Integer.parseInt(in.readLine());
t=n;
s=0;
while(n>0)
{
r=n%10;
s=s+(r*r*r);
n=n/10;
}
if(t==s)
{
System.out.println("Armstrong
No");
}
else
{
System.out.println("Not
Armstrong No");
}
}
}
class arm
{
public static void
main(String arg[])throws IOException
{
arms a=new arms();
}
}
Arrays
Arrays are a way to store a list of
items. Each slot of the array holds an individual element, and we can place
elements into or change the contents or those slots. Any type of element
values=Primitive types or objects
Declaring
Array Variables:
String
ch[];
Point
hits[];
int
temp[];
String[]
ch;
Point[]
hits;
Int[]
temp;
Creating
Array Objects
Using new
String[] names=new String[10];
Directly initializing the contents of
that array
String[] fruits={”Apple”,”Orange”}
Example
import
java.io.*;
class
arr
{
int
i;
int
a[]={1,2,3,4,5,6,7,8,9,10};
void
result()
{
System.out.println(“Array
details”);
for(i=0;i<10;i++)
{
System.out.println(a[i]);
}
}
public
static void main(String arg[])
{
arr
d=new arr();
d.result();
}
}
Assigning
Array Elements
myArray[subscript];
Example
Stirng[]
arr=new String[10];
arr[10]=”eggplant”;
Changing
Array Elements
myarray[1]=15;
sentence[0]=”The”;
sentence[10]=sentence[0];
Example
import
java.io.*;
class
charr
{
int
i;
int
a[]=new int[10];
void
add()
{
int j=20;
for(i=0;i<a.length;i++)
{
a[i]=j;
j++;
}
}
void
disp()
{
for(i=0;i<a.length;i++)
{
System.out.println(i
+”Array Element is”+a[i]);
}
}
public
static void main(String args[])
{
charr
n=new charr();
n.add();
n.disp();
}
}
Multidimentsional Arrays:
int cords[ ][ ]=new int[12][12];
coords[0][0]=1;
cords[0][1]=2;
import
java.io.*;
class marr
{
int i=0;
int j=0;
int mul[ ][ ]=new int[3][3];
void add()
{
mul[0][0]=1;
mul[0][1]=2;
mul[0][2]=3;
mul[1][0]=4;
mul[1][1]=5;
mul[1][2]=6;
mul[2][0]=7;
mul[2][1]=8;
mul[2][2]=9;
}
void disp()
{
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
System.out.print(mul[i][j]+”
“);
System.out.print(“
“);
}
System.out.println(“
“);
}
}
public static void main(String args[])
{
marr n=new marr();
n.add();
n.disp();
}
}
Strings
Combination of characters
Instances of the class string
The
String Constructor
String s=new String();
Example
char chars[]={‘a’,’b’,’c’};
String a=new
String(chars);
String(char chars[],int startIndex,int
numChars)
Example
char chars[]={‘a’,’b’,’c’,’d’,’e’};
String a=new
String(chars,2,3);
Example
1. import java.io.*;
class make
{
public static void main(String arg[])
{
char c[]={’j’,’a’,’v’,’a’};
String s1=new String (c);
String s2=new String(s1);
System.out.println(s1);
System.out.println(s2);
}
}
String Length
2. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="HAI";
int
l=s1.length();
System.out.println("The
length of the String is:"+l);
}
}
String
toLowercase
3. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="HAI";
String
s2=s1.toLowerCase();
System.out.println("Lower
case is:"+s2);
}
}
String
toUppercase
4. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="hai";
String
s2=s1.toUpperCase();
System.out.println("Upper
case is:"+s2);
}
}
String trim
5. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="hai";
String
s2=s1.trim();
System.out.println("The
String is:"+s2);
}
}
String
concatenation
6. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="hai";
String
s2="computer";
String
s3=s1.concat(s2);
System.out.println("The
String is:"+s3);
}
}
7.String
replace:
import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="hai";
String
s2=s1.replace('c','s');
System.out.println("The
String is:"+s2);
}
}
String
equals
8. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="hai";
String
s2="computer";
boolean
s3=s1.equals(s2);
System.out.println("The
String is:"+s3);
}
}
String char
at a location:
9. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="hai";
char
s2=s1.charAt(0);
System.out.println("The
String is:"+s2);
}
}
String
compare to
10. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="Programming With Java ";
String
s2="Programming";
int
s3=s1.compareTo(s2);
System.out.println("The
Result is:"+s3);
}
}
String
substring
11. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="Java Programming ";
String
s2=s1.substring(6);
System.out.println("The
Result is:"+s2);
}
}
String
indexof
12. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
String
s1="Java Programming ";
int
s2=s1.indexOf('J');
System.out.println("The
Result is:"+s2);
}
}
String
buffer length
13. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
StringBuffer
s1=new StringBuffer("Java");
int
s2=s1.length();
System.out.println("The
Result is:"+s2);
}
}
String
buffer capacity
14. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
StringBuffer
s1=new StringBuffer("Java");
int
s2=s1.capacity();
System.out.println("The
Result is:"+s2);
}
}
String
buffer length
15. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
StringBuffer
s1=new StringBuffer("Java");
int
n=s1.length();
System.out.println("The
length is:"+n);
System.out.println("The
String is:"+s1);
s1.setLength(2);
int
m=s1.length();
System.out.println("The
length is:"+m);
System.out.println("The
String is:"+s1);
}
}
String
buffer setcharat
16. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
StringBuffer
s1=new StringBuffer("Java");
s1.setCharAt(2,'w');
System.out.println("The
String is:"+s1);
}
}
String
buffer insert
17. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
StringBuffer
s1=new StringBuffer("She is a teacher");
s1.insert(7,"
best");
System.out.println("The
String is:"+s1);
}
}
String buffer
append
18. sss
String
buffer reverse
19. import java.io.*;
class
sample
{
public
static void main(String arg[])
{
StringBuffer
s1=new StringBuffer("Java ");
s1.reverse();
System.out.println("The
String is:"+s1);
}
}
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