java String类

String示例：

packageHomeWork;

publicclassStringTest {

publicstaticvoidmain(String[] args) {

// endsWith();// endsWith的测试;

// indexOf();//indexOf的测试;

// charAt();//charAt的测试;

// tString();//toString的测试;

// split();//split的测试;

// trim();//trim的测试;

// substring();//substring的测试;

// contains();//contains的测试;

// compareTo();//compareTo的测试;

//concat();//concat的测试;

// isEmpty();//isEmpty的测试;

// replace();//replace的测试;

// subString();//substring的测试;

// lowerCase();//lowercase的测试;

//copyValue();//copyValue的测试;

}

publicstaticvoidendsWith() {

String endsWith =newString("123456");

booleanresult = endsWith.endsWith("8");

System.out.println("123456是以8结尾的吗" + result);

System.out.println("-----------------------");

}

publicstaticvoidindexOf() {

String a = "123456";

System.out.println(a.indexOf("1"));

System.out.println("-----------------------");

}

publicstaticvoidcharAt() {

String s = "12345678";

System.out.println(s.charAt(1));

System.out.println("-----------------------");

}

publicstaticvoidtString() {

String s = "001235677";

System.out.println(s.toString());

System.out.println("-----------------------");

}

publicstaticvoidsplit() {

// split第一种用法;

String s = "100-86-11";

String[] array = s.split("-");

for(inti = 0; i < array.length; i++) {

System.out.print(array[i]);

}

System.out.println("\n" + "-----------------------");

// split第二种用法;

String s2 = "welcome to www baidu com";

String[] array2 = s2.split("w", 4);

for(inti = 0; i < array2.length; i++) {

System.out.print(array2[i]);

}

System.out.println("\n" + "-----------------------");

}

publicstaticvoidtrim() {

String s = " helloworld ";

System.out.println("开始s的长度 " + s.length());

s = s.trim();

System.out.println("现在s的长度 " + s.length());

}

publicstaticvoidsubstring() {

String s = "this is a cat";

s = s.substring(1);

System.out.println(s);

}

publicstaticvoidcontains() {

String s = "test a contains";

booleanresult = s.contains("t");

System.out.println(result);

}

publicstaticvoidcompareTo() {

String a = "a";

String b = "b";

intresult = a.compareTo(b);

System.out.println(result);

}

publicstaticvoidconcat() {

String s = "abcd";

s = s.concat("d");

System.out.println(s);

}

publicstaticvoidisEmpty() {

String s = "";

booleanresult = s.isEmpty();

System.out.println(result);

}

publicstaticvoidreplace() {

String s = "abcde";

s = s.replace(s, "f");

System.out.println(s);

}

publicstaticvoidsubString() {

String s = "abcdef";

s = s.substring(0, 1);

System.out.println(s);

}

publicstaticvoidlowerCase() {

String s = "ABCDE";

s = s.toLowerCase();

System.out.println(s);

}

publicstaticvoidcopyValue() {

char[] s = { 'a', 'b', 'c', 'd' };

String s1 = String.copyValueOf(s, 0, 1);

System.out.println(s1);

}

}