[英]How to sort the arrays in ArrayList?
我有ArrayList,它包含许多数组,每个数组包含名字,姓氏。 现在我想根据姓氏对列表进行排序。
例:
ArrayList<String[]> list=new ArrayList<String[]>();
String[] name1={"koti" ,"reddy"};
String[] name2={"hanu" ,"sanjay"};
String[] name3={"ajay" ,"zedeja"};
String[] name4={"basha" ,"kadhar"};
list.add(name1);
list.add(name2);
list.add(name3);
list.add(name4);
我想要这样的排序顺序:
basha kadhar
koti reddy
hanu sanjay
ajay zedeja
请您尽快提供帮助,谢谢
编写一个自定义的比较器,并将其与数据一起提供给适当的sort
重载。
但是,我建议使用单独的Person/Name
类型而不是String数组,因为它可以使数据更容易跟踪, 并且可以实现Comparable (这将消除/替换Comparator的需求)。
现在,在编写适用的compare/compareTo
,代码应类似于:
int cmpLastName = a_lastName.compareTo(b_lastName);
if (cmpLastName == 0) {
// same lastname, order now based on first name
return a_firstName.compareTo(b_firstName);
} else {
// different lastname, so have enough ordering
return cmpLastName;
}
尝试这个
Collections.sort(list, new Comparator<String[]>() {
@Override
public int compare(String[] o1, String[] o2) {
int c = o1[0].compareTo(o2[0]);
if (c != 0) {
return c;
}
return o1[1].compareTo(o2[1]);
}
});
这就是我执行该排序操作的方式。
public static void main(String[] args) {
ArrayList<String[]> list = new ArrayList<String[]>();
String[] name1 = { "koti", "reddy" };
String[] name2 = { "hanu", "sanjay" };
String[] name3 = { "ajay", "zedeja" };
String[] name4 = { "basha", "kadhar" };
list.add(name1);
list.add(name2);
list.add(name3);
list.add(name4);
System.out.println("Before sorting");
for (String[] r : list) {
System.out.println(Arrays.toString(r));
}
Collections.sort(list, new Comparator<String[]>() {
public int compare(String[] left, String[] right) {
if (left == null) { // null?
if (right == null) { // null == null!
return 0;
}
return -1; // null < not(null)
} else if (right == null) {
return 1; // not(null) > null.
}
// If the last names aren't the same, return the result
// of comparing the last names.
if (left[1].compareTo(right[1]) != 0) {
return left[1].compareTo(right[1]);
}
// Return the result of comparing the first names.
return left[0].compareTo(right[0]);
}
});
System.out.println("After sorting");
for (String[] r : list) {
System.out.println(Arrays.toString(r));
}
}
尝试使用此代码来实现输出。
public static void main(String []args){
ArrayList<String[]> list=new ArrayList<String[]>();
String[] name1={"koti" ,"reddy"};
String[] name2={"hanu" ,"sanjay"};
String[] name3={"ajay" ,"zedeja"};
String[] name4={"basha" ,"kadhar"};
list.add(name1);
list.add(name2);
list.add(name3);
list.add(name4);
Collections.sort(list, new Comparator<String[]>() {
@Override
public int compare(String[] s1, String[] s2) {
int i = s1[0].compareTo(s2[0]);
if (i != 0) {
return i;
}
return s1[1].compareTo(s2[1]);
}
});
System.out.println("after sorting"+"\n");
for (String[] s : list) {
for(int i=0;i<s.length;i++){
System.out.print(s[i]+"\t");
}
System.out.print("\n");
}
}
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