java培训教学部分代码

50个数字（整数，每个数字的范围是0//importpublicclass{publicstaticvoidmain(String[]{int[]count=newRandomrandom=newRandom();for(inti=0;i<50;i++){intnumber=random.nextInt(41)+10;//[10,50]count[number-}for(inti=0;i<count.length;{if(0=={}System.out.println((10i)出现次数：}intmax=for(inti=0;i<count.length;{if(max<{max=}} max+"次for(inti=0;i<count.length;{if(max=={System.out.println(i+}}}}//Mappackageimportjava.util.ArrayList;importjava.util.Collection;importjava.util.I importjava.util.List;importjava.util.Map;importjava.util.Random;importjava.util.Set;importpublicclass{publicstaticvoidmain(String[]{Mapmap=newTreeMap();//数字及其出现的次数（key为数字，value为数字Randomrandom=newRandom();for(inti=0;i<50;i++){intnumber=random.nextInt(41)+10;Integerin=newInteger(number);if(map.get(in)=={}{}}

map.put(in,newintvalue=((Integer)map.get(in)).intValue();map.put(in,newInteger(value+1));Collectioncols=IntegermaxOccurs=(Integer)Collections.max(cols);Setset=map.entrySet();Listlist=newArrayList();//出现次数最大的数for toriter= tor();{Map.Entryentry=(Map.Entry)Integerkey=(Integer)entry.getKey();Integervalue=(Integer)entry.getValue();if(Value()=={}System.out.println(key+":"+}System.out.println("出现的最多次数为：maxOccurs);for toriter= tor();{}}}packageimportjava.util.I importjava.util.Set;publicclass{publicstaticvoidmain(String[]{Propertiesp=System.getProperties();Setset=p.keySet(); toriter= tor();{Stringkey=(String)iter.next();Stringvalue=p.getProperty(key);System.out.println(key+"="+}}} {privateBooleanpublicNameSortStrategy(Boolean{this.isAsc=}publicvoid >{Collections.sort(