59 lines
1.0 KiB
Java
59 lines
1.0 KiB
Java
// streams/FunctionMap.java
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// ©2016 MindView LLC: see Copyright.txt
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import java.util.*;
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import java.util.stream.*;
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import java.util.function.*;
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class FunctionMap {
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static String[] elements = { "12", "", "23", "45" };
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static Stream<String> testStream() {
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return Arrays.stream(elements);
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}
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static void
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test(String descr, Function<String, String> func) {
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System.out.println(" ---( " + descr + " )---");
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testStream()
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.map(func)
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.forEach(System.out::println);
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}
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public static void main(String[] args) {
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test("add brackets", s -> "[" + s + "]");
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test("Increment", s -> {
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try {
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return Integer.parseInt(s) + 1 + "";
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} catch(NumberFormatException e) {
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return s;
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}
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});
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test("Replace", s -> s.replace("2", "9"));
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test("Take last digit", s -> s.length() > 0 ?
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s.charAt(s.length() - 1) + "" : s);
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}
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}
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/* Output:
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---( add brackets )---
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[12]
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[]
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[23]
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[45]
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---( Increment )---
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13
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24
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46
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---( Replace )---
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19
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93
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45
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---( Take last digit )---
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2
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3
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5
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*/
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