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Challenge 51.

Comparator, Collections

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	`1`	`+package challenge51_60;`
	`2`	`+`
	`3`	`+import java.util.ArrayList;`
	`4`	`+import java.util.Collections;`
	`5`	`+import java.util.Comparator;`
	`6`	`+`
	`7`	`+/**`
	`8`	`+ * Comparator.comparing method`
	`9`	`+ * Collections.sort(list, comparator)`
	`10`	`+ */`
	`11`	`+public class Challenge_51 {`
	`12`	`+`
	`13`	`+ public static void main( String[] args ) {`
	`14`	`+ ArrayList<Jedi> arrayList = new ArrayList<>();`
	`15`	`+ arrayList.add(new Jedi("Anakin",10));`
	`16`	`+ arrayList.add(new Jedi("Luke",5));`
	`17`	`+ arrayList.add(new Jedi("Luke",6));`
	`18`	`+ arrayList.add(new Jedi("Obi Wan",7));`
	`19`	`+`
	`20`	`+ Comparator<Jedi> comparator = Comparator.comparing(Jedi::getName)`
	`21`	`+ .thenComparing(( o1, o2 ) -> o2.age.compareTo(o1.getAge()));`
	`22`	`+ Collections.sort(arrayList, comparator);`
	`23`	`+ arrayList.forEach(jedi -> System.out.println(jedi.name+":"+jedi.age));`
	`24`	`+ }`
	`25`	`+`
	`26`	`+`
	`27`	`+`
	`28`	`+ static class Jedi{`
	`29`	`+ String name;`
	`30`	`+ Integer age;`
	`31`	`+`
	`32`	`+ public Jedi( String name, Integer age ) {`
	`33`	`+ this.name = name;`
	`34`	`+ this.age = age;`
	`35`	`+ }`
	`36`	`+`
	`37`	`+ public String getName() {`
	`38`	`+ return name;`
	`39`	`+ }`
	`40`	`+`
	`41`	`+ public Integer getAge() {`
	`42`	`+ return age;`
	`43`	`+ }`
	`44`	`+ }`
	`45`	`+}`

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