Java For Testers: Learn Java fundamentals fast by Alan Richardson

Author:Alan Richardson [Richardson, Alan]
Language: eng
Format: epub
Publisher: Compendium Developments Ltd
Published: 2015-03-01T05:00:00+00:00

Bob said "hello" to his cat's friend

This is a single backslash \

Exercise: Try using the other escape characters

Experiment with some @Test methods which use the other escape characters in a string e.g. "\t", "\b",

"\n", "\r" and see the effect when you use System.out.println to print to the console output.

String Concatenation

We have already seen as a method of concatenating strings. The is also useful as a way of adding primitives and other objects on to the String.

String ps1 = "This is " "String2";

assertThat(ps1, is("This is String2"));

String ps2 = "This is " 4;

assertThat(ps2, is("This is 4"));

The String class has a concat method which allows us to concatenate other strings. This does not allow us to concatenate other objects on to the String.

String thisIs = "This is ";

String s1 = thisIs.concat("String1");

assertThat(s1, is("This is String1"));

Converting to/from a String

Converting to a String with toString

Most classes override the toString method to provide a way of creating a String representation of the object.

This provides a useful way of converting to a String, and this is the method called when you concatenate a String with a different type using .

For primitive types, the associated object version is used e.g. for int the Integer.toString is used.

String intConcatConvert = "" 1;

assertThat(intConcatConvert, is("1"));

String integerIntConvert = Integer.toString(2);

assertThat(integerIntConvert, is("2"));

The String class itself has the valueOf method which takes objects and primitives and converts them to a String. For objects, the object’s toString method is used for the conversion.

String integerStringConvert = String.valueOf(3);

assertThat(integerStringConvert, is("3"));

In addition you can convert from byte[] and char[] (and other objects) to a String using the String constructor.

Converting from a String

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