String s = new String("xyz");创建了几个String Object? 二者之间有什么区别?
String s = new String("xyz");创建了几个String Object?
二者之间有什么区别?
String s = new String("xyz");创建了几个String Object?
二者之间有什么区别?
判断:
public class test
{
private static String s="string";
public static void main(String a[])
{
String t="strin"+"g";
System.out.println(s==t);
}
}
String s = new String(xyz);创建了几个String Object
String s = new String("xyz");创建了几个String Object?
二者之间有什么区别?
A.s.equals(t);
B.t.equals(c);
C.s==t;
D.t.equals(new String("hello"));
A.String str = s.append(“aaa”);
B.String str = s.concat(s);
C.String str = s.substring(3);
D.以上语句都不会
public class Something {
public static void main(String[] args) {
Something s = new Something();
System.out.println("s.doSomething() returns " + doSomething());
}
public String doSomething() {
return "Do something ...";
}
}
看上去很完美。
public class Something {
public static void main(String[] args) {
Something s = new Something();
System.out.println("s.doSomething() returns " + doSomething());
}
public String doSomething() {
return "Do something ...";
}
}
看上去很完美。
public class Something {
public static void main(String[] args) {
Something s = new Something();
System.out.println("s.doSomething() returns " + doSomething());
}
public String doSomething() {
return "Do something ...";
}
}
看上去很完美。
public class Something {
public static void main(String[] args) {
Something s = new Something();
System.out.println("s.doSomething() returns " + doSomething());
}
public String doSomething() {
return "Do something ...";
}
}
看上去很完美。
public void actionPerformed(ActionEvent e)
{
int sum;
if(e.getSource()==button)
{
String s=text1.getText();
StringTokenizer fenxi=new StringTokenizer(s,",/t/n");
int n=fenxi.countTokens();
double a[]=new double[n];
for(int i=0;i<n;i++)
{
String temp=fenxi.nextToken();
a[i]=Double.valueof(temp).doubleValue();
}
sum=0;
for(int i=0;i<n;i++)
sum+=[i];
text2.setText(""+sum);
}
}