String类的常用构造方法的小小演示

public class Demo1 {
	//I'm zhuobinzhou 
	//不加static，将报错：Cannot make a static reference to the non-static field str
	static String str = new String();//使用String()创建一个空字符序列
	static String str1 = new String("I'm");
	static char[] ch = new char[]{' ','z','h','u','o'};
	static String str2 = new String(ch);
	static int[] cp = new int[]{98,105,110};
	static String str3 = new String(cp,0,3);
	static byte[] bytes = new byte[]{97+25,97+7,97+14,97+20};
	static String str4 = new String(bytes,0,4);
	static StringBuffer buffer = new StringBuffer(". " +
			"I want to make friends with you.");
	static String str5 = new String(buffer);
	static StringBuilder builder = new StringBuilder("If you want," +
			"please add my !");
	static String str6 = new String(builder);
	
	public static void main(String args[]){
		
		str = "Hello,";
		System.out.println(str);
		System.out.println(str1);
		System.out.println(str2);
		System.out.println(str3);
		System.out.println(str4);
		System.out.println(str5);
		System.out.println(str6);
		str += str1 + str2 + str3 + str4 + str5 + str6 ;
		System.out.println(str);
		
		
	}
	
}

 效果：

Hello,
I'm
 zhuo
bin
zhou
. I want to make friends with you.
If you want,please add

Hello,I'm zhuobinzhou. I want to make friends with you.If you want,please add my QQ number :750603686!