stringdemo.java

本java源程序包括了大量的学习程序（共27章）方便大家学习

package test;

public class StringDemo 
{
	String str1 = "Hello world!This is Java code.";
	String str2;
	String str3 = new String("This is Java code.");
	public StringDemo()
	{
		str2 = new String("This is Java code.");
		System.out.println("str1 is: "+str1);
		System.out.println("str2 is: "+str2);
		System.out.println("str3 is: "+str3+"\n");
		System.out.println("Each item of str1 is:");
		for(int i=0;i<str1.length();i++)
	    {   //使用charAt()方法得到String字符串中指定位置的字符，并利用循环分别输出
	    	char c = str1.charAt(i);
	    	System.out.print("\""+c+"\",");
	    }
		System.out.println();
		byte b[] = str1.getBytes();
		//使用String类的getBytes()方法，得到str1中所有字符对应的Unicode编码，并存入byte型数组b中
		System.out.println("Change each item of str1 to unicode is:");
		for(int i=0;i<b.length;i++)
	    {   //利用循环分别输出str1中，所有元素对应的字符的Unicode编码
	    	System.out.print(b[i]+",");
	    }
		System.out.println();
		System.out.print("The result of comparing str2 and str3 is:");
		System.out.println(str2.equals(str3));
		System.out.println("\nReplace all charcters \"a\" to \"e\" in str2");
		System.out.println("The result of str2.replace() is: "+str2.replace('a','e'));
		System.out.println("str2 is: "+str2+"\n");
		System.out.print("The result of whether str1 is beginning with \"Hello\":");
		System.out.println(str1.startsWith("Hello"));
	}
	public static void main(String[] args) 
	{
		StringDemo stringDemo = new StringDemo();
	}

}