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String str = "tutorialpro";

String str2 = new String("tutorialpro");

String s1 = "tutorialpro";              // String direct creation
String s2 = "tutorialpro";              // String direct creation
String s3 = s1;                    // Same reference
String s4 = new String("tutorialpro");   // String object creation
String s5 = new String("tutorialpro");   // String object creation

public class StringDemo {
   public static void main(String args[]) {
      char[] helloArray = { 'r', 'u', 'n', 'o', 'o', 'b' };
      String helloString = new String(helloArray);  
      System.out.println(helloString);
   }
}

tutorialpro

public class StringDemo {
    public static void main(String args[]) {
        String site = "www.tutorialpro.org";
        int len = site.length();
        System.out.println("tutorialpro.org website length: " + len);
    }
}

tutorialpro.org website length: 14

string1.concat(string2);

"My name is ".concat("tutorialpro");

"Hello, " + " tutorialpro" + "!"

"Hello, tutorialpro!"

public class StringDemo {
    public static void main(String args[]) {     
        String string1 = "tutorialpro.org website: ";     
        System.out.println("1、" + string1 + "www.tutorialpro.org");  
    }
}

1、tutorialpro.org website: www.tutorialpro.org

System.out.printf("The value of the float variable is " +
                  "%f, while the value of the integer variable is " +
                  "%d, and the value of the string variable is " +
                  "%s", floatVar, intVar, stringVar);

String fs;
fs = String.format("The value of the float variable is " +
                   "%f, while the value of the integer variable is " +
                   "%d, and the value of the string variable is " +
                   "%s", floatVar, intVar, stringVar);