数组值交换详解-优快云博客

本文链接：https://blog.youkuaiyun.com/zhewendechibang/article/details/41764345

本文通过三个实例：整型数组、字符串数组及对象数组，详细解释了如何在Java中实现数组值的交换，并说明了虽然数组地址不变，但可以通过方法调用成功交换数组中的元素值。

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整型数组的情形：

public class TestArrayINT {

static void changeT (int[] a, int[] b) {

int temp;

for(int i = 0 ; i < a.length ; i ++){

temp = a[i];

a[i] = b[i];

b[i] = temp;

}

public static void main(String[] args) {

int A[] = {1,2,3,4,5};

int B[] = {0,0,0,0,0};

System.out.println(A);

System.out.println(B);

for(int i = 0 ; i <A.length ; i ++){

System.out.print(A[i] + " ");

}

System.out.println();

for(int i = 0 ; i <B.length ; i ++){

System.out.print(B[i] + " ");

}

System.out.println();

changeT(A,B);

for(int i = 0 ; i <A.length ; i ++){

System.out.print(A[i] + " ");

}

System.out.println();

for(int i = 0 ; i <B.length ; i ++){

System.out.print(B[i] + " ");

}

System.out.println(A);

System.out.println(B);

}

从结果看，A，B的地址并没有改变，但是却实现了数组A与数组B的值的改变；

字符串数组的情形：

public class TestArrayString {

static void changeT (String[] a, String[] b) {

String temp;

for(int i = 0 ; i < a.length ; i ++){

temp = a[i];

a[i] = b[i];

b[i] = temp;

}

public static void main(String[] args) {

String A[] = {"1","2","3","4","5"};

String B[] = {"0","0","0","0","0"};

System.out.println(A);

System.out.println(B);

for(int i = 0 ; i <A.length ; i ++){

System.out.print(A[i] + " ");

}

System.out.println();

for(int i = 0 ; i <B.length ; i ++){

System.out.print(B[i] + " ");

}

System.out.println();

changeT(A,B);

for(int i = 0 ; i <A.length ; i ++){

System.out.print(A[i] + " ");

}

System.out.println();

for(int i = 0 ; i <B.length ; i ++){

System.out.print(B[i] + " ");

}

System.out.println();

System.out.println(A);

System.out.println(B);

} }

从结果看，A，B的地址并没有改变，但是却实现了数组A与数组B的值的改变；

对象数组的情形：

class person {

private String name;

public person(String name){

this.name = name;

}

public String getName() {

return name;

}

public class TestObjuectString {

static void changeT (person[] a, person[] b) {

person temp;

for(int i = 0 ; i < a.length ; i ++){

temp = a[i];

a[i] = b[i];

b[i] = temp;

}

public static void main(String[] args) {

person A[] = {new person("tom"),new person("jack"),new person("lucy"),new person("tim")};

person B[] = {new person("o1"),new person("o2"),new person("o3"),new person("o4")};

System.out.println(A);

System.out.println(B);

for(int i = 0 ; i <A.length ; i ++){

System.out.print(A[i].getName() + " ");

}

System.out.println();

for(int i = 0 ; i <B.length ; i ++){

System.out.print(B[i].getName() + " ");

}

System.out.println();

changeT(A,B);

for(int i = 0 ; i <A.length ; i ++){

System.out.print(A[i].getName() + " ");

}

System.out.println();

for(int i = 0 ; i <B.length ; i ++){

System.out.print(B[i].getName() + " ");

}

System.out.println();

System.out.println(A);

System.out.println(B);

}

从结果看，A，B的地址并没有改变，但是却实现了数组A与数组B的值的改变；

由此可以的得到：在数组传递的过程中是可以改变数组中各个元素的值，但是数组的地址是不变的；

java中数组传递