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BAEL-1237 String Formatter (eugenp#2912)
* Example Code For Evaluation Article This is an example code for the evaluation article on "Different Types of Bean Injection in Spring" * Added unit tests * Minor changes to application context * Removed code committed for evaluation article * BAEL-944 Demonstrating the problems with new Url pattern matching in Spring 5 * BAEL-944 Demonstrating the problems with new Url pattern matching in Spring 5 * BAEL-944 Exploring the Spring MVC URL Matching Improvements * BAEL-944 Exploring the Spring MVC URL Matching Improvements * BAEL-944 Exploring the Spring MVC URL Matching Improvements * BAEL-944 Code Formatting and solving build issue * BAEL-944 Resolving build issue due to change in Spring version * BAEL-944 Resolving build issue * BAEL-944 Formatting code * BAEL-944 Moving tests to correct package * BAEL-944 Moving tests to correct package * BAEL-944 Replacing @RequestMapping by @GetMapping * BAEL-944 Remove unnecessary attribute name, "value" in annotations * BAEL-79 Intro to Activiti with Spring * BAEL-79 Intro to Activiti with Spring * BAEL-79 Adding activiti module to the parent modules * BAEL-79 Using latest version * BAEL-79 Update Spring boot version that works with Activiti * BAEL-79 Replace RequestMapping with GetMapping * BAEL-79 Use Java 8 Syntax * BAEL-79 Formatting * BAEL-79 changed module name * BAEL-378 A Guide to Activiti with Java * BAEL-79 Fixed unit tests * BAEL-79 Simplified the process * BAEL-79 Fix test cases * BAEL-1045 Lambda Behave * BAEL-1045 Lambda Behave * BAEL-1045 Lambda Behave * BAEL-1090 Difference between compact and compressed strings in Java 9 * BAEL-1237 String Formatter * BAEL-1237 String Formatter * BAEL-1237 String Formatter * BAEL-1237 String Formatter * BAEL-1237 Guide to java.util.Formatter
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‎core-java/src/test/java/com/baeldung/string/formatter/StringFormatterExampleTests.java‎

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package com.baeldung.string.formatter;
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import java.util.Calendar;
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import java.util.Formatter;
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import java.util.GregorianCalendar;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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import org.junit.Test;
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public class StringFormatterExampleTests {
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@Test
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public void givenString_whenFormatSpecifierForCalendar_thenGotExpected() {
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//Syntax of Format Specifiers for Date/Time Representation
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Calendar c = new GregorianCalendar(2017, 11, 10);
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String s = String.format("The date is: %1$tm %1$te,%1$tY", c);
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assertEquals("The date is: 12 10,2017", s);
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}
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@Test
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public void givenString_whenGeneralConversion_thenConvertedString() {
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//General Conversions
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String s = String.format("The correct answer is %s", false);
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assertEquals("The correct answer is false", s);
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s = String.format("The correct answer is %b", null);
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assertEquals("The correct answer is false", s);
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s = String.format("The correct answer is %B", true);
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assertEquals("The correct answer is TRUE", s);
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}
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@Test
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public void givenString_whenCharConversion_thenConvertedString() {
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//Character Conversions
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String s = String.format("The correct answer is %c", 'a');
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assertEquals("The correct answer is a", s);
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s = String.format("The correct answer is %c", null);
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assertEquals("The correct answer is null", s);
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s = String.format("The correct answer is %C", 'b');
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assertEquals("The correct answer is B", s);
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s = String.format("The valid unicode character: %c", 0x0400);
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assertTrue(Character.isValidCodePoint(0x0400));
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assertEquals("The valid unicode character: Ѐ", s);
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}
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@Test(expected = java.util.IllegalFormatCodePointException.class)
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public void givenString_whenIllegalCodePointForConversion_thenError() {
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String s = String.format("The valid unicode character: %c", 0x11FFFF);
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assertFalse(Character.isValidCodePoint(0x11FFFF));
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assertEquals("The valid unicode character: Ā", s);
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}
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@Test
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public void givenString_whenNumericIntegralConversion_thenConvertedString() {
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//Numeric Integral Conversions
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String s = String.format("The number 25 in decimal = %d", 25);
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assertEquals("The number 25 in decimal = 25", s);
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s = String.format("The number 25 in octal = %o", 25);
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assertEquals("The number 25 in octal = 31", s);
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s = String.format("The number 25 in hexadecimal = %x", 25);
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assertEquals("The number 25 in hexadecimal = 19", s);
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}
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@Test
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public void givenString_whenNumericFloatingConversion_thenConvertedString() {
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//Numeric Floating-point Conversions
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String s = String.format("The computerized scientific format of 10000.00 "
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+ "= %e", 10000.00);
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assertEquals("The computerized scientific format of 10000.00 = 1.000000e+04", s);
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s = String.format("The decimal format of 10.019 = %f", 10.019);
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assertEquals("The decimal format of 10.019 = 10.019000", s);
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}
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@Test
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public void givenString_whenLineSeparatorConversion_thenConvertedString() {
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//Line Separator Conversion
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String s = String.format("First Line %nSecond Line");
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assertEquals("First Line \n"
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+ "Second Line", s);
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}
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@Test
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public void givenString_whenSpecifyFlag_thenGotFormattedString() {
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//Without left-justified flag
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String s = String.format("Without left justified flag: %5d", 25);
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assertEquals("Without left justified flag: 25", s);
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//Using left-justified flag
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s = String.format("With left justified flag: %-5d", 25);
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assertEquals("With left justified flag: 25 ", s);
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}
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@Test
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public void givenString_whenSpecifyPrecision_thenGotExpected() {
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//Precision
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String s = String.format("Output of 25.09878 with Precision 2: %.2f", 25.09878);
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assertEquals("Output of 25.09878 with Precision 2: 25.10", s);
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s = String.format("Output of general conversion type with Precision 2: %.2b", true);
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assertEquals("Output of general conversion type with Precision 2: tr", s);
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}
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@Test
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public void givenString_whenSpecifyArgumentIndex_thenGotExpected() {
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Calendar c = new GregorianCalendar(2017, 11, 10);
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//Argument_Index
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String s = String.format("The date is: %1$tm %1$te,%1$tY", c);
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assertEquals("The date is: 12 10,2017", s);
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s = String.format("The date is: %1$tm %<te,%<tY", c);
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assertEquals("The date is: 12 10,2017", s);
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}
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@Test
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public void givenAppendable_whenCreateFormatter_thenFormatterWorksOnAppendable() {
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//Using String Formatter with Appendable
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StringBuilder sb = new StringBuilder();
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Formatter formatter = new Formatter(sb);
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formatter.format("I am writting to a %1$s Instance.", sb.getClass());
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assertEquals("I am writting to a class java.lang.StringBuilder Instance.", sb.toString());
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}
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@Test
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public void givenString_whenNoArguments_thenExpected() {
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//Using String Formatter without arguments
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String s = String.format("John scored 90%% in Fall semester");
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assertEquals("John scored 90% in Fall semester", s);
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}
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}

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