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给出下列【代码】注释标注的代码的输出结果。import java.util.*;public class E {public static void main(String args[]) {TreeSet mytree=new TreeSet();mytree.add(100);mytree.add(12);mytree.add(30);mytree.add(9);int m = mytree.first();int n = mytree.last();System.out.printf("%d,%d",m,n);//【代码】}}

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给出下列【代码】注释标注的代码的输出结果。import java.util.*;public class E {public static void main(String args[]) {TreeSet mytree=new TreeSet();mytree.add(100);mytree.add(12);mytree.add(30);mytree.add(30);mytree.add(9);mytree.add(9);System.out.printf("%d", mytree.size()); //【代码】}}

给出下列【代码】注释标注的代码的输出结果。import java.util.*;public class E {public static void main(String args[]) {TreeMap treemap= new TreeMap();treemap.put(12,"hello");treemap.put(1,"java");treemap.put(1,"你好");System.out.printf("%d", treemap.size()); //【代码】}}

给出下列【代码】注释标注的代码的输出结果。import java.util.*;public class E {public static void main(String args[]) {TreeMap treemap= new TreeMap();treemap.put(12,"hello");treemap.put(1,"java");treemap.put(5,"你好");treemap.put(3,"home");int m =treemap.firstKey();int n =treemap.lastKey();String s1 =treemap.get(m);String s2 =treemap.get(n);System.out.printf("%s,%s", s1,s2); //【代码】}}

给出下列【代码】注释标注的代码的输出结果。import java.util.*;public class E {public static void main(String args[]) {TreeMap treemap= new TreeMap();treemap.put(12,"d");treemap.put(1,"b");treemap.put(5,"r");treemap.put(3,"i");Collection cn =treemap.values();Iterator iterator = cn.iterator();String s1 =iterator.next();String s2 =iterator.next();String s3 =iterator.next();String s4 =iterator.next();System.out.printf("%s%s%s%s", s1,s2,s3,s4); //【代码】}}