java中关于参数传递问题的解释（传…

//这里注释的部分都不见了，所以我把这篇文章同时发表到了优快云上，有不懂得朋友，可以到

// 优快云源码及注释链接查看，只是自己的一点总结，如果大家发现不对的地方，欢迎给小弟提出建议和意见。

package cn.edu.nwsuaf.cie.qhs;

public class ArgumentPassing {

private int num1 = 1;

private int num2 = 2;

public int getNum1() {

return num1;

}

public void setNum1(int num1) {

this.num1 = num1;

}

public int getNum2() {

return num2;

}

public void setNum2(int num2) {

this.num2 = num2;

}

public void swap(){

int temp = this.getNum1();

this.setNum1(this.getNum2());

this.setNum2(temp);

}

public void swap(int num1, int num2){

int temp = num1;

num1 = num2;

num2 = temp;

}

public void swap(String str1,String str2){

String tempStr = str1;

str1 = str2;

str2 = tempStr;

}

public void swap(ArgumentPassing arg1,ArgumentPassing arg2){

int num1 = arg1.getNum1();

arg1.setNum1(arg2.getNum2());

arg2.setNum2(num1);

}

public void swap(int[] array,int pos1,int pos2){

int temp = array[pos1];

array[pos1] = array[pos2];

array[pos2] = temp;

}

public String toString(){

return "This object contains paramaters such as below: num1 = "+ this.getNum1()+";num2="+this.getNum2();

}

public static void main(String[] args) {

// TODO Auto-generated method stub

ArgumentPassing argPassing = new ArgumentPassing();

int num1 = 1;

int num2 = 2;

System.out.println("调用全局变量情况下的swap()方法之前：num1="+argPassing.getNum1()+";num2="+argPassing.getNum2());

argPassing.swap();

System.out.println("调用全局变量情况下的swap()方法之后：num1="+argPassing.getNum1()+";num2="+argPassing.getNum2());

System.out.println("******************************************************************************************");

System.out.println("调用传值传参情况下的swap(int,int)方法之前：num1="+num1+";num2="+num2);

argPassing.swap(num1, num2);

System.out.println("调用传值传参情况下的swap(int,int)方法之后：num1="+num1+";num2="+num2);

System.out.println("******************************************************************************************");

String str1 = "This is str1";

String str2 = "This is Str2";

System.out.println("调用传递引用传参情况下的swap(String,String)方法之前：str1="+str1+";str2="+str2);

argPassing.swap(str1, str2);

System.out.println("调用传递引用传参情况下的swap(String,String)方法之后：str1="+str1+";str2="+str2);

System.out.println("******************************************************************************************");

ArgumentPassing arg1 = new ArgumentPassing();

ArgumentPassing arg2 = new ArgumentPassing();

System.out.println("调用传递引用传参情况下的swap(ArgumentPassing,ArgumentPassing)方法之前：arg1="+arg1.toString()+";arg2="+arg2.toString());

argPassing.swap(arg1, arg2);

System.out.println("调用传递引用传参情况下的swap(ArgumentPassing,ArgumentPassing)方法之后：arg1="+arg1.toString()+";arg2="+arg2.toString());

System.out.println("******************************************************************************************");

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

int pos1 = 0;

int pos2 = 1;

System.out.println("调用数组传参情况下的swap(int[],int pos1,int pos2)方法之前：array[pos1]="+array[pos1]+";array[pos2]="+array[pos2]);

argPassing.swap(array, pos1, pos2);

System.out.println("调用数组传参情况下的swap(int[],int pos1,int pos2)方法之后：array[pos1]="+array[pos1]+";array[pos2]="+array[pos2]);

}

}