count occurrences of character in string in java

String s = "...";
int counter = 0;

 for( int i=0; i<s.length(); i++ )
{

if( s.charAt(i) == '@' )
{
counter++;
 }

 }

ArrayList in java

List<String> someList = new ArrayList<String>()
 // add "monkey", "donkey", "skeleton key" to someList

 someList.add(monkey1);
 someList.add(donkey2);
 someList.add(skeleton key3);
 someList.add(tesrt4);
 for(String item : someList )
 {

 System.out.println(item);

 }

How to add item to arraylist in java

How to add item to arraylist in java

List<String> someList = new ArrayList<String>()
 // add "monkey", "donkey", "skeleton key" to someList
someList.add(monkey1);
someList.add(donkey2);
someList.add(skeleton key3);
someList.add(tesrt4);

for(String item : someList )
{

 System.out.println(item);

 }

iterate through list java 

iterate through list using for each in java

 iterate through list using for each in java

List<String> someList = new ArrayList<String>()
 // add "monkey", "donkey", "skeleton key" to someList
someList.add(monkey1);
someList.add(donkey2);
someList.add(skeleton key3);
someList.add(tesrt4);

for(String item : someList )
{

 System.out.println(item);

 }

add comment block to methods in Eclipse

How to add comment block to methods in Eclipse..

Source -> Generate element comment

 

/**

*

*comment

*

*/

public void tets(){

 

}

An internal error occurred during: "Importing Maven projects". Unsupported IClasspathEntry kind=4 fixed

You might have used this command "mvn install" and then you have imported this project in to the eclipse.

 to solve this

 1)Right-click on your project, select Maven -> Remove Maven Nature.
 2)Open you terminal, go to your project folder and do “mvn eclipse:clean”
 3)Right click on your Project and select “Configure -> Convert into Maven Project” This is the error to solve this use above steps.









string-pattern-matched-in-java.html

string pattern matched in java

string pattern in java

public class RegexMatches {
public static void main( String args[] ){
 // String to be scanned to find the pattern.
String line = "xxxx123@gmail.com";
String pattern = "@gmail.com";

if(line.endwith(pattern ))
{
 sysout("Matched");

     }else{
 sysout("Not Matched");
}
}
}

boolean check in if in java

boolean isS
if (status) { //positive work } else { // negative work }

string is null or empty check in java

string null check in java

If we want to check weather string is empty or not then use the

String  str ="null";

if(str != null && !str.isEmpty())
{
 sysout("null");
}
else{
 sysout("not null");

}