Strings.java

public class S
{
    public static void main(String[] args)
    {
        String str="Hello Java";
        System.out.println("String"+str+"'");
        //1.length()
        System.out.println("Length"+str.length());
        //2.trim()
        System.out.println("trim()'"+str.trim()+"'");
        //3.toUpperCase()
        System.out.println("uppercase"+str.toUpperCase());
        //4.toLowerCase()
        System.out.println("lowercase"+str.toLowerCase());
        //5.charAt()
        System.out.println("index 2"+str.charAt(2));
        //6.substring()
        System.out.println("substring"+str.substring(2,7));
        //7.contains()
        System.out.println("contains"+str.contains("Java"));
        //8.equals()
        System.out.println("equals "+str.equals(" Hello Java "));
        //9.equalsIgnoreCase()
        System.out.println("equalsIgnoreCase "+str.equalsIgnoreCase(" hello java "));
        //10.startsWith() and endsWith()
        System.out.println("starts"+str.startsWith(" He"));
        System.out.println("ends"+str.endsWith("va "));
        //11.replace()
        System.out.println("replace"+str.replace("Java","World"));
        //12.indexOf()
        System.out.println("Indexof'J'"+str.indexOf("J"));
        //13.concat()
        System.out.println("concat"+str.concat("programming"));
    }
}