Arrays类可以包含各种操作数组的方法，并且还包含静态工厂方法，允许将数组视为列表。Java 9向Arrays类添加了三个重要的方法：Arrays.equals()，Arrays.compare()和Arrays.mismatch()。
Arrays.equal() - 在Java 9中，Arrays.equals()方法添加了几个重载方法。新方法为提供的两个数组添加了fromIndex和toIndex参数。这些方法根据它们的相对索引位置检查两个数组的相等性。
<strong>public static boolean equals(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)</strong>
在上述语法中，如果两个指定的int数组和指定的范围内的元素相等，则该方法返回true。第二个方法对于char数组也是一样的。
import java.util.Arrays;
public class CompareArrayTest {
public static void arrayEqualsTest() {
int[] existRows = {0, 1, 2, 3, 4, 5};
int[] newRows = {3, 4, 5, 1, 2, 0};
System.out.println(<strong>Arrays</strong>.<strong>equals</strong>(existRows, newRows));
System.out.println(<strong>Arrays</strong>.<strong>equals</strong>(existRows, 1, 3, newRows, 3, 5));
System.out.println(<strong>Arrays</strong>.<strong>equals</strong>(existRows, 3, 5, newRows, 0, 2));
}
public static void main(String args[]) {
CompareArrayTest.arrayEqualsTest();
}
}false true true
Arrays.compare() − In Java 9, few parameters have added to the Arrays.compare() method. With fromIndex/toIndex parameters that are used for relative position comparison.
<strong>public static int compare(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)</strong>
In the above syntax, the method compares two int arrays lexicographically over the specified ranges.
import java.util.Arrays;
public class LexicographicalArraysTest {
public static void main(String args[]) {
LexicographicalArraysTest.compareSliceArraysTest();
}
public static void compareSliceArraysTest() {
int[] tomMarks = {5, 6, 7, 8, 9, 10};
int[] daisyMarks = {5, 6, 7, 10, 9, 10};
int[] maryMarks = {5, 6, 7, 8};
System.out.println(<strong>Arrays.compare</strong>(tomMarks, 0, 3, daisyMarks, 0, 3));
System.out.println(<strong>Arrays.compare</strong>(tomMarks, 0, 4, maryMarks, 0, maryMarks.length));
System.out.println(<strong>Arrays.compare</strong>(daisyMarks, 0, 4, maryMarks, 0, maryMarks.length));
}
}<strong>0 0 1</strong>
Arrays.mismatch() −In Java 9, there are other overloaded methods of the Arrays.mismatch() method that enables us to find and return the index of the first mismatch between two slices of arrays.
<strong>public static int mismatch(int[] a, int aFromIndex, int aToIndex, int[] b, int bFromIndex, int bToIndex)</strong>
In the above syntax, the method finds and returns the relative index of the first mismatch between two int arrays over the specified range. It returns -1 if no mismatch has found. The index in the range of 0 (inclusive) up to the length (inclusive) of the smaller range.
import java.util.Arrays;
public class MismatchMethodTest {
public static void main(String[] args) {
MismatchMethodTest.mismatchArraysTest();
}
public static void mismatchArraysTest() {
int[] a = {1, 2, 3, 4, 5};
int[] b = {1, 2, 3, 4, 5};
int[] c = {1, 2, 4, 4, 5, 6};
System.out.println(<strong>Arrays.mismatch</strong>(a, b));
System.out.println(<strong>Arrays.mismatch</strong>(a, c));
System.out.println(<strong>Arrays.mismatch</strong>(a, 0, 2, c, 0, 2));
System.out.println(<strong>Arrays.mismatc</strong><strong>h</strong>(a, 0, 3, c, 0, 3));
System.out.println(<strong>Arrays.mismatch</strong>(a, 2, a.length, c, 2, 5));
}
}<strong>-1 2 -1 2 0</strong>
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