Java 数组不匹配()方法示例
原文:https://www . geesforgeks . org/Java-array-mismatch-method-with-examples/
Java . util包中的 数组 类是 Java Collection Framework 的一部分。这个类提供了动态创建和访问 Java 数组的静态方法。它只包含静态方法和对象类的方法。这个类的方法可以由类名本身使用。
*mismatch()* 是在 Java.util 包的 Arrays 类下定义的方法，它是针对在 mismatch 方法中作为参数传递的两个数组使用的。此方法返回作为参数传递给 mismatch()函数的两个数组具有第一个不相等元素的索引。检查两个数组是否包含相同的对应元素非常有用。当出现不匹配时，这将做出响应。如果两个数组有相同的对应元素，那么这个函数返回-1。我们可以通过下面的例子来理解它的工作原理:
给我们两个数组，array1 = {2，6，1，10}和 array2 = {2，6，11，12}，我们想找到 array1 和 array2 具有第一个不等元素的索引。由于前两个索引具有相同的对应元素集，因此索引为 2。
借助 mismatch()方法，我们可以在不迭代数组的情况下完成上述任务。
*语法:*
Arrays.mismatch(first_array, second_array);
*参数:*上述方法接受以下参数:
*1。* first_array:特定数据类型的数组(第一个数组名)。
*2。* second_array:同类型的另一个数组(第二个数组名)。
*返回值:*
*1。-1:* 如果两个数组在所有对应的位置都有相同的元素。
*2。非负整数:*两个数组都有第一个不相等元素的索引。
*注意:*两个数组的数据类型必须相同，此方法遵循从零开始的索引。
*例 1:*
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate the working of
// mismatch() method with arrays of integer type
// Including necessary import statements
import java.io.*;
import java.util.Arrays;
class GFG {
public static void main(String[] args)
{
// Initializing an integer array
int array1[] = { 2, 7, 11, 22, 37 };
// Initializing another array
int array2[] = { 2, 7, 11, 22, 37 };
// Initializing another array
int array3[] = { 2, 7, 19, 31, 39, 56 };
// Return the first index at which array1
// array2 have the different element
int index1 = Arrays.mismatch(array1, array2);
// Return the first index at which array1
// array3 have the different element
int index2 = Arrays.mismatch(array1, array3);
// Return the first index at which array2
// array3 have the different element
int index3 = Arrays.mismatch(array2, array3);
// Print the first index at which array1
// array2 have the different element
System.out.println(
"The index at which array1 and array2 have first unequal element: "
+ index1);
// Print the first index at which array1
// array3 have the different element
System.out.println(
"The index at which array1 and array3 have first unequal element: "
+ index2);
// Print the first index at which array2
// array3 have the different element
System.out.println(
"The index at which array2 and array3 have first unequal element: "
+ index3);
}
}
**Output
The index at which array1 and array2 have first unequal element: -1
The index at which array1 and array3 have first unequal element: 2
The index at which array2 and array3 have first unequal element: 2
```**
****例 2:****
## **Java 语言(一种计算机语言，尤用于创建网站)**
```java
// Java program to demonstrate the working of
// mismatch() method with arrays of double type
// Including necessary import statements
import java.io.*;
import java.util.Arrays;
class GFG {
public static void main(String[] args)
{
// Initializing an array containing double values
double array1[]
= { 11.21, 22.31, 33.15, 44.18, 55.19, 66.666 };
// Initializing another array
double array2[]
= { 11.21, 22.31, 33.15, 44.18, 55.19, 66.666 };
// Initializing another array
double array3[] = { 11.21, 22, 33, 44, 55, 66 };
// Return the first index at which array1
// array2 have the different element
int index1 = Arrays.mismatch(array1, array2);
// Return the first index at which array1
// array3 have the different element
int index2 = Arrays.mismatch(array1, array3);
// Return the first index at which array2
// array3 have the different element
int index3 = Arrays.mismatch(array2, array3);
// Print the first index at which array1
// array2 have the different element
System.out.println(
"The index at which array1 and array2 have first unequal element: "
+ index1);
// Print the first index at which array1
// array3 have the different element
System.out.println(
"The index at which array1 and array3 have first unequal element:"
+ index2);
// Print the first index at which array2
// array3 have the different element
System.out.println(
"The index at which array2 and array3 have first unequal element: "
+ index3);
}
}
**Output
The index at which array1 and array2 have first unequal element: -1
The index at which array1 and array3 have first unequal element:1
The index at which array2 and array3 have first unequal element: 1
```**
****例 3:****
## **Java 语言(一种计算机语言，尤用于创建网站)**
```java
// Java program to demonstrate the working of
// mismatch() method with arrays of character type
// Including necessary import statements
import java.io.*;
import java.util.Arrays;
class GFG {
public static void main(String[] args)
{
// Initializing an character array
char array1[] = { 'g', 'e', 'e', 'k', 's' };
// Initializing another array
char array2[] = { 'g', 'e', 'e', 'k', 's' };
// Initializing another array
char array3[] = { 'g', 'e', 'e', 'k' };
// Return the first index at which array1
// array2 have the different element
int index1 = Arrays.mismatch(array1, array2);
// Return the first index at which array1
// array3 have the different element
int index2 = Arrays.mismatch(array1, array3);
// Return the first index at which array2
// array3 have the different element
int index3 = Arrays.mismatch(array2, array3);
// Print the first index at which array1
// array2 have the different element
System.out.println(
"The index at which array1 and array2 have first unequal element: "
+ index1);
// Print the first index at which array1
// array3 have the different element
System.out.println(
"The index at which array1 and array3 have first unequal element: "
+ index2);
// Print the first index at which array2
// array3 have the different element
System.out.println(
"The index at which array2 and array3 have first unequal element: "
+ index3);
}
}
**Output
The index at which array1 and array2 have first unequal element: -1
The index at which array1 and array3 have first unequal element: 4
The index at which array2 and array3 have first unequal element: 4
```**
****例 4:****
## **Java 语言(一种计算机语言，尤用于创建网站)**
```java
// Java program to demonstrate the working of
// mismatch() method with arrays of boolean type
// Including necessary import statements
import java.io.*;
import java.util.Arrays;
class GFG {
public static void main(String[] args)
{
// Initializing a boolean array
boolean array1[] = { true, false, true, false };
// Initializing another array
boolean array2[] = { true, false, true, false };
// Initializing another array
boolean array3[] = { true, false, false, true };
// Return the first index at which array1
// array2 have the different element
int index1 = Arrays.mismatch(array1, array2);
// Return the first index at which array1
// array3 have the different element
int index2 = Arrays.mismatch(array1, array3);
// Return the first index at which array2
// array3 have the different element
int index3 = Arrays.mismatch(array2, array3);
// Print the first index at which array1
// array2 have the different element
System.out.println(
"The index at which array1 and array2 have first unequal element: "
+ index1);
// Print the first index at which array1
// array3 have the different element
System.out.println(
"The index at which array1 and array3 have first unequal element: "
+ index2);
// Print the first index at which array2
// array3 have the different element
System.out.println(
"The index at which array2 and array3 have first unequal element: "
+ index3);
}
}
**Output
java
The index at which array1 and array2 have first unequal element: -1
The index at which array1 and array3 have first unequal element: 2
The index at which array2 and array3 have first unequal element: 2**
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