Det underliste() metode for List Interface returnerer en visning af den del af denne liste mellem de inkluderende og eksklusive parametre. Denne metode eliminerer behovet for eksplicitte rækkeviddeoperationer.
parallel bearbejdning
Syntaks
public List subList(int fromIndex, int toIndex)
Parametre
Parametrene 'fromIndex' og 'toIndex' repræsenterer underlistens lave og høje endepunkt.
Vend tilbage
SubList()-metoden returnerer en visning af det angivne område inden for denne liste.
Kaster:
IndexOutOfBoundsException - Denne undtagelse vil kaste efter en ulovlig slutpunktsindeksværdi, dvs. fraIndex-størrelse eller fraIndex > tilIndex.
Eksempel 1
import java.util.LinkedList; import java.util.List; public class JavaListSubListExample1 { public static void main(String[] args) { int fromIndex=2; int toIndex=7; List list= new LinkedList(); for (int i=1;i<=10;i++){ 2 7 list.add(i); } system.out.println('list : '+list); it will return the elements present from index to at list.sublist(fromindex,toindex); system.out.println('elements position '+list.sublist(2,7)); < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> List : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Elements from 2 index position to 7 index position : [3, 4, 5, 6, 7] </pre> <h2>Example 2</h2> <pre> import java.util.LinkedList; import java.util.List; public class JavaListSubListExample_2 { public static void main(String[] args) { List list= new LinkedList(); for (char ch='a';chtoIndex it will throw an exception System.out.println('List : '+list.subList(18,12)); } } </pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Total alphabets : 26 Exception in thread 'main' java.lang.IllegalArgumentException: fromIndex(18) >toIndex(12) atjava.util.SubList.(AbstractList.java:624) atjava.util.AbstractList.subList(AbstractList.java:484) at com.javaTpoint.JavaListSubListExample2.main(JavaListSubListExample2.java:12) </pre> <h2>Example 3</h2> <pre> import java.util.LinkedList; import java.util.List; public class JavaListSubListExample_3 { public static void main(String[] args) { List list= new LinkedList(); for (char ch='a';ch<='z';ch++){ list.add(ch); } system.out.println('total alphabets : '+list.size()); if fromindex<-1 || toindex< -1 it will throw an exception system.out.println('list '+list.sublist(-1,-1)); < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Total alphabets : 26 Exception in thread 'main' java.lang.IndexOutOfBoundsException: fromIndex = -1 atjava.util.SubList.(AbstractList.java:620) atjava.util.AbstractList.subList(AbstractList.java:484) at com.javaTpoint.JavaListSubListExample3.main(JavaListSubListExample3.java:13) </pre></='z';ch++){></pre></=10;i++){> Eksempel 2
import java.util.LinkedList; import java.util.List; public class JavaListSubListExample_2 { public static void main(String[] args) { List list= new LinkedList(); for (char ch='a';chtoIndex it will throw an exception System.out.println('List : '+list.subList(18,12)); } } Test det nu Produktion:
Total alphabets : 26 Exception in thread 'main' java.lang.IllegalArgumentException: fromIndex(18) >toIndex(12) atjava.util.SubList.(AbstractList.java:624) atjava.util.AbstractList.subList(AbstractList.java:484) at com.javaTpoint.JavaListSubListExample2.main(JavaListSubListExample2.java:12)
Eksempel 3
import java.util.LinkedList; import java.util.List; public class JavaListSubListExample_3 { public static void main(String[] args) { List list= new LinkedList(); for (char ch='a';ch<=\'z\';ch++){ list.add(ch); } system.out.println(\'total alphabets : \'+list.size()); if fromindex<-1 || toindex< -1 it will throw an exception system.out.println(\'list \'+list.sublist(-1,-1)); < pre> <span> Test it Now </span> <p> <strong>Output:</strong> </p> <pre> Total alphabets : 26 Exception in thread 'main' java.lang.IndexOutOfBoundsException: fromIndex = -1 atjava.util.SubList.(AbstractList.java:620) atjava.util.AbstractList.subList(AbstractList.java:484) at com.javaTpoint.JavaListSubListExample3.main(JavaListSubListExample3.java:13) </pre></=\'z\';ch++){>