1:字符串与字符数组之间的转换: 字符串转为字符数组: public char[] toCharArray() 字符数组转为字符串: public String(char[] value) public String(char[] value,int offset, int count) 例: public class Test0 { /** * @param args */ public static void main(String[] args) { String str1 = "Hello"; char c[] = str1.toCharArray(); // 将一个字符串变为字符数组 for(int i = 0; i0) System.out.println("str1>str2"); if(str1.compareTo(str2)==0) System.out.println("str1==str2"); if(str1.compareTo(str2)<0) System.out.println("str1