简单的测试一下String和StringBuilder是值传递还是引用传递

package com.xiaojiang.test;

public class Test {
//一个简单的例子来说明String和StringBuilder是值传递还是引用传递
public static void main(String[] args) {
String str = "jiangshijun";
changeValue(str);
System.out.println(str);

StringBuilder sb = new StringBuilder();
sb.append("xiaojiang");
changeValueSB(sb);
System.out.println(sb.toString());

}

public static void changeValue(String str){
str = "hello"+str;
}

public static void changeValueSB(StringBuilder str){
str.append("  nihao");
}

//结果：
//	jiangshijun
//	xiaojiang  nihao

}