我有一个泡泡排序函数, 可以用“ a” 变量命令 SomeObj 链接列表列表。 如果我想同时用“ b” 变量排序列表, 那么如何? 如何用 b 来代替写入另一个函数?
public static void BubbleSort(LinkedList<SomeObj> objs) {
int len = objs.size();
for(int pass = 1; pass < len; pass++) {
for (int i=0; i < len - pass; i++) {
if(objs.get(i).a > objs.get(i + 1).a) {
SomeObj p = objs.get(i);
objs.set(i,objs.get(i+1));
objs.set(i + 1, p);
}
}
}
}
Implement Comparator interface in a class with its compare method. that accepts two objects and compares them which returns -ve,0,+ve values to tell less than , equal or greater than.
创建此比较器的一个对象, 并将其传递到泡沫排序方法, 让它使用比较方法比较这两个对象 。
您的天体应该拥有所有这些字段的梯子 。
每当您想更改对象 s 的比较标准时, 使用不同的比较器 。
请选中此 < a href=>" "http://www.java Developmenter.co.in/java-example/java-comparator-example.html" rel="nofollow" >example 。
您会让 SomeObj 执行 可比较 接口, 然后使用该接口与它互动 。
如果您能用第一个“a”来排序,那么“b”就是在您的 SomeObj 类中执行可比较的比较课程,并进行比较。
决定哪个是最高优先级。 检查高优先级变量 - 如果它们不同, 排序就像您只是根据它进行排序。 如果高优先级变量匹配, 那么您必须返回到低优先级变量, 并以此为基础进行整个比较 。 我认为最简单的方法就是交换变量值而不是列表项目。使用这种方法,您可以同时以不同的方式“排序”列表。 我猜测有某种误解 - 它不是关于排序 一个然后B, 它是一种2列表之一, 用户想要分类 两者都独立, 但不创建第二个列表, 或者我是不是不对? 用于对列表进行排序 类似此主方法中的类似方法 现在您可以对 b 值进行比较, 并使用该比较器的收藏. sort 。
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if (obj1.getA() != obj2.getA()) {
// do compare on As
// e.g. return onj2.getA() - obj1.getA()
}
else { // A s match, so do compares on B
// e.g. return obj2.getB() - obj1.getB()
}
Collections.sort(List list, Comparator c));
class Pair{
int a;
int b;
public Pair(int a, int b) {
this.a=a;
this.b=b;
}
public String toString() {
// TODO Auto-generated method stub
return "["+a+","+b+"]";
}
//test
public static void main(String[] args) {
Comparator<Pair> comparatorA=new Comparator<Pair>() {
@Override
public int compare(Pair o1, Pair o2) {
if (o1.a>o2.a) return 1;
if (o1.a<o2.a) return -1;
return 0;
}
};
LinkedList<Pair> list=new LinkedList<>();
list.add(new Pair(1,2));
list.add(new Pair(2,1));
list.add(new Pair(3,1));
list.add(new Pair(1,3));
Collections.sort(list, comparatorA);
System.out.println(list);
}
}
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