Java常见笔试面试题目深度剖析系列之：Java方法参数传递详解

package com.test;

class ParamTest {

public void changeInt(int i) {
i = 2;
}

public void changeString(String str) {
str = "xyz";
}

public void changePoint(Point point) {
point.x = 5;
point.y = 6;
}

public void change(char c, char[] ch) {
c = 'A';
ch[0] = 'B';
}

public static void main(String[] args) {
ParamTest test = new ParamTest();

int i = 1;
test.changeInt(i);
System.out.println("changeInt=" + i);

String s = "abc";
test.changeString(s);
System.out.println("changeString=" + s);

Point point = new Point(1, 2);
test.changePoint(point);
System.out.println("changePoint-->x=" + point.x);
System.out.println("changePoint-->y=" + point.y);

char c = 'C';
char ch[] = new char[] { 'O', 'P', 'Q' };
test.change(c, ch);
System.out.println("change-->c=" + c);
System.out.println("change-->ch[0]=" + ch[0]);

}

}

class Point {
int x;
int y;

public Point(int x, int y) {
this.x = x;
this.y = y;
}
}

结果：

changeInt=1
changeString=abc
changePoint-->x=5
changePoint-->y=6
change-->c=C
change-->ch[0]=B