Java Tutorial/Data Type/Convert to String

Convert a byte array to base64 string

public class Main {
  public static void main(String[] argv) throws Exception {
    
    byte[] buf = new byte[] { 0x12, 0x23 };
    String s = new sun.misc.BASE64Encoder().encode(buf);
  }
}

Convert Characters to Lower Case

public class Main {
  public static void main(String[] args) {
    String str = "This Is a Test";
    str = str.toLowerCase();
    System.out.println(str);
  }
}
//this is a test

Convert Characters to Upper Case

public class Main {
    
    public static void main(String[] args) {
        
        String str = "this is a test";
        
        str = str.toUpperCase();
        
        System.out.println(str);
    }
}
//THIS IS A TEST

Converting a Primitive Type Value to a String

public class Main {
  public static void main(String[] argv) throws Exception {
    // Use String.valueOf()
    String s = String.valueOf(true);
    s = String.valueOf((byte) 0x11);
    s = String.valueOf((byte) 0xFF);
    s = String.valueOf("a");
    s = String.valueOf((short) 123);
    s = String.valueOf(123);
    s = String.valueOf(123L);
    s = String.valueOf(1.23F);
    s = String.valueOf(1.23D);
    // Use +
    s = "" + true;
    s = "" + ((byte) 0x12);
    s = "" + ((byte) 0xFF);
    s = "" + "a";
    s = "" + ((short) 123);
    s = "" + 111;
    s = "" + 111L;
    s = "" + 1.11F;
    s = "" + 1.11D;
  }
}

Converting byte to String

public class MainClass {
  public static void main(String[] arg) {
    byte b = 12;
    System.out.println(String.valueOf(b));   
  }
}

12

Converting Char array to String

public class MainClass {
  public static void main(String[] arg) {
    char[] ch = {"a","b","c","d"};
    System.out.println(String.valueOf(ch));   
  }
}

abcd

Converting double to String

public class MainClass {
  public static void main(String[] arg) {
    double f = 12.13145D;
    System.out.println(String.valueOf(f));   
  }
}

12.13145

Converting float to String

public class MainClass {
  public static void main(String[] arg) {
    float f = 12.13145F;
    System.out.println(String.valueOf(f));   
  }
}

12.13145

Converting Integer to Hex String

public class MainClass{
  public static void main(String[] arg){
     System.out.println(Integer.toHexString(10)); 
     System.out.println(Integer.toHexString(20));
     System.out.println(Integer.toHexString(30));
     System.out.println(Integer.toHexString(40));     
  }
}

a
14
1e
28

Converting int to binary string

public class MainClass {
  public static void main(String[] arg) {
    System.out.println(Integer.toBinaryString(100));   
  }
}

1100100

Converting int to String

public class MainClass {
  public static void main(String[] arg) {
    int b = 12;
    System.out.println(String.valueOf(b));   
  }
}

12

Converting long to String

public class MainClass {
  public static void main(String[] arg) {
    long b = 12L;
    System.out.println(String.valueOf(b));   
  }
}

12

Converting short to String

public class MainClass {
  public static void main(String[] arg) {
    short f = 12;
    System.out.println(String.valueOf(f));   
  }
}

12

Convert int to Octal String

public class MainClass {
  public static void main(String[] arg) {
    System.out.println(Integer.toOctalString(10));   
  }
}

12

Convert String to java int Example

public class Main {
  public static void main(String[] args) {
    String str = new String("10");
    int i = Integer.parseInt(str);
    System.out.println(i);
  }
}

valueOf(): convert to String

public class MainClass {
  public static void main(String[] arg) {
    byte b = 12;
    System.out.println(String.valueOf(b));   
  }
}

12