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在 Java 中有几种方法可以使数组与另一个数组相等。本教程演示如何在 Java 中将一个数组值设置为等于另一个数组值。

在 Java 中设置一个数组等于另一个数组

如上所述，可以使用多种方式将 Java 中的数组设置为与另一个数组相等。这里有几种方法：

让我们尝试一个可以实现上述所有方法的示例。

package jiyik;

import java.util.Arrays;

public class Array_Copy {
    public static void main(String args[]) {

        //Method 1: Copy array by the same length
        String[] Array1 = {"delftstack1", "delftstack2", "delftstack3"};
        String[] Array2 = new String[Array1.length];
        for (int i = 0; i < Array2.length; i++) {
           Array2[i] = Array1[i];
        }
        System.out.println("Method 1: ");
        System.out.print("Array 1: "+Arrays.toString(Array1));
        System.out.print("\nArray 2: "+Arrays.toString(Array2));

        //Method 2: Using System.arraycopy method
        String[] Array3 = {"jiyik1", "jiyik2", "jiyik3"};        String[] Array4 = new String[Array3.length];
        System.arraycopy(Array3, 0, Array4, 0, Array4.length);

        System.out.println("\nMethod 2: ");
        System.out.print("Array 3: "+Arrays.toString(Array3));
        System.out.print("\nArray 4: "+Arrays.toString(Array4));

        //Method 3: using clone() method
        String[] Array5 = {"jiyik1", "jiyik2", "jiyik3"};
        String[] Array6 = Array5.clone();

        System.out.println("\nMethod 3: ");
        System.out.print("Array 5: "+Arrays.toString(Array5));
        System.out.print("\nArray 6: "+Arrays.toString(Array6));

        //Method 4: using Arrays.copyOf() and Arrays.copyOfRange() methods
        String[] Array7 = {"jiyik1", "jiyik2", "jiyik3"};
        String[] Array8 = Arrays.copyOf(Array7, 3);
        String[] Array9 = Arrays.copyOfRange(Array7, 0, 3);

        System.out.println("\nMethod 4: ");
        System.out.print("Array 7: "+Arrays.toString(Array7));
        System.out.print("\nArray 8: "+Arrays.toString(Array8));
        System.out.print("\nArray 9: "+Arrays.toString(Array9));

        //Method 5: using clone() method
        String[] Array10 = {"jiyik1", "jiyik2", "jiyik3"};
        String[] Array11 = Array10;

        //Check the side effect
        Array10[2]= "Changed";
        System.out.println("\nMethod 5: ");
        System.out.print("Array 10: "+Arrays.toString(Array10));
        System.out.print("\nArray 11: "+Arrays.toString(Array11));

    }

}

上面的代码使用了上面描述的所有方法，并在 Java 中设置一个数组等于另一个数组，复制一个数组。见输出：

Method 1:
Array 1: [jiyik1, jiyik2, jiyik3]
Array 2: [jiyik1, jiyik2, jiyik3]
Method 2:
Array 3: [jiyik1, jiyik2, jiyik3]
Array 4: [jiyik1, jiyik2, jiyik3]
Method 3:
Array 5: [jiyik1, jiyik2, jiyik3]
Array 6: [jiyik1, jiyik2, jiyik3]
Method 4:
Array 7: [jiyik1, jiyik2, jiyik3]
Array 8: [jiyik1, jiyik2, jiyik3]Array 9: [jiyik1, jiyik2, jiyik3]
Method 5:
Array 10: [jiyik1, jiyik2, Changed]
Array 11: [jiyik1, jiyik2, Changed]