问题补充说明：Book[] book = new Book[]{ new Book("name1",price1), new Book("name2",price2), new Book("name3",price3), } 其中Book是一个类有两个属性：书名和价格。 之后用Arrays.sort().的方法根据书的价格进行从小大的顺序排序。怎么派啊？
使用TreeSet，给你贴个例子，把Dog换成你的Book就行了
publicclassTr推施西eeSetDemo{
publicstaticv材老李者林低oidmain(String[]args){
TreeS角是与氢章etts=newTreeSet(newDogComparate("age"));
ts.add(newDog("b动bb",8f,9f济希效括波质九费));
ts.add(360问答newDog("aaa",5f,6f));
Sy利经巴究固婷般茶stem.out.println(((D轮善触合川烧话万刻求og)ts.first()).getName());
}
}
//DogComparate比较物件
classDogComparateextendsComparate{
publicDogComparate(Stringattri脸问普事孔孙毛诗维速bute){
this.setAttribute(attribute);
}
p积量战间技础地ublicintname(Dogdog1,Dogdog2){
if(dog1.getName().equals(dog2革.getName())){
return0;
}else{
char[]char1=null;
char[]char2=null;
booleanb=true;
if(dog1.getName().length()<=dog2.getName().len且张余为草gth()){
char1=dog1.g击抗仍补映别度木etName().toCharArray();
char2=dog2.getName().toCharArray();
b=true;
}else{
char1=dog2.getName().toCharArray责();
char2=dog1.getName().toCharArray();
b=false;
}
for(inti=0;i<char1.length;i++){
if(char1[i]==char2[i]){
continue;
}elseif(char1[i]>char2[i]){
retu重个古已质导酒rn(b?1:-1);
}elseif(c铁首演倒模har1[i]<char2[i]){
asserttrue;
return(b?-1:1);
}
}
return(b?-1:1);
}
}
publicintage(Dogdog1,Dogdog2){
if(dog1.getAge()>dog2.getAge()){
return1;
}elseif(dog1.getAge()==dog构歌反龙抗势2.getAge())看权施的参抓{
return0;
}el角板seif(dog1.getAge()<dog2.getAge()){
return-1;
}
return0;
}
}
//Comparate是作Comparator的抽象介面
classComparateimplementsComparator{
privateStringattribute;
publicStringgetAttribute(){
returnattribute;
}
publicvoidsetAttribute(Stringattribute){
this.attribute=attribute;
}
publicintcompare(Objectarg0,Objectarg1){
try{
Classcls=Class.forName(this.getClass().getName());
Class[]parTypes=newClass[]{arg0.getClass(),arg1.getClass()};
Methodmetd=cls.getMethod(this.attribute,parTypes);
ComparatemetdObj=this;
Object[]args=newObject[]{arg0,arg1};
Objectrtn=metd.invoke(metdObj,args);
return((Integer)rtn).intValue();
}catch(ClassNotFoundExceptione){
e.printStackTrace();
}catch(SecurityExceptione){
e.printStackTrace();
}catch(NoSuchMethodExceptione){
e.printStackTrace();
}catch(IllegalArgumentExceptione){
e.printStackTrace();
}catch(IllegalAccessExceptione){
e.printStackTrace();
}catch(InvocationTargetExceptione){
e.printStackTrace();
}
return0;
}
}
//Dog物件,事实上你要用Cat物件都可以!!
classDog{
privatefloatage;
privateStringname;
privatefloatweight;
publicDog(Stringname,floatage,floatweight){
***.name=name;
this.age=age;
this.weight=weight;
}
publicvoidsetName(Stringname){
***.name=name;
}
publicStringgetName(){
return***.name;
}
publicvoidsetAge(floatage){
this.age=age;
}
publicfloatgetAge(){
returnthis.age;
}
publicvoidsetWeight(floatweight){
this.weight=weight;
}
publicfloatgetWeight(){
returnthis.weight;
}
}
标签：arrays,sort
