Java String测试_javastring测试-优快云博客

本文探讨了Java中字符串操作的细节，特别是如何修改不同作用域内的字符串变量，并通过实例展示了字符串引用和内存分配的过程。

public class StringTest {

	public static String one = null;
	public static String two = null;
	public static String three = null;

	public static void modifystr1(String str) {
		System.out.println("str:"+str);
		System.out.println("one:"+one);
		System.out.println(one == str);
		str = "string one";
		System.out.println(one == str);
		System.out.println();
	}
	public static void modifystr2(String str) {
		System.out.println("str:"+str);
		System.out.println("two:"+two);
		System.out.println(two == str);
		str = "string two";
		System.out.println(two == str);
		System.out.println();
	}
	public static void modifystr3(String str) {
		System.out.println("str:"+str);
		System.out.println("three:"+three);
		System.out.println(three == str);
		str = "string three";
		System.out.println(three == str);
		System.out.println();
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		System.out.println("start one");
		one = new String("string one");
		modifystr1(one);
		
		System.out.println("start two");
		two = new String("string two").intern();
		modifystr2(two);
		
		System.out.println("start three");
		three = "string three";
		modifystr3(three);
	}
}

运行结果：

start one
str:string one
one:string one
true
false

start two
str:string two
two:string two
true
true

start three
str:string three
three:string three
true
true