刚才在网上看到一个Java程序，编译显示：使用或覆盖了已过时的API,如何解决？
- 提问者网友：半生酒醒
- 2021-05-01 10:16
- 五星知识达人网友：逃夭
- 2021-05-01 11:12
这个警告的意思是，DataInputStream类的readLine()方法已经过时，不推荐使用了。
- 1楼网友：琴狂剑也妄
- 2021-05-01 12:35
import java.io.*; public class Complex { public double real; public double imag; public Complex() { } public Complex(double realNum,double imagNum) { this.real=realNum; this.imag=imagNum; }
public String toString(Complex complex) { if(complex.real==0.0) { if(complex.imag==0.0) { return " 0"; } else { return (complex.imag+"i"); } } else { if((complex.imag)>0.0) { return (complex.real+"+"+complex.imag+"i"); } else if((complex.imag)==0.0) { return (" "+complex.real); } else { return (complex.real+""+complex.imag+"i");//小心会相加的用""隔开 } } //return (complex.real+"+"+complex.imag+"i"); }
public Complex AddComplex(Complex x1,Complex x2) { Complex result=new Complex(); result.real=x1.real+x2.real; result.imag=x1.imag+x2.imag; return result; }
public Complex SubComplex(Complex x1,Complex x2) { Complex result=new Complex(); result.real=x1.real-x2.real; result.imag=x1.imag-x2.imag; return result; }
public Complex MulComplex(Complex x1,Complex x2) { Complex result=new Complex(); result.real=x1.real*x2.real-x1.imag*x2.imag; result.imag=x1.imag*x2.real+x1.real*x2.imag; return result; }
public Complex DivComplex(Complex x1,Complex x2) { Complex result=new Complex(); result.real=(x1.real*x2.real+x1.imag*x2.imag)/(x2.real*x2.real+x2.imag*x2.imag); result.imag=(x1.imag*x2.real-x1.real*x2.imag)/(x2.real*x2.real+x2.imag*x2.imag); return result; }
//测试上述运算方法 public static void main(String[] args) throws IOException {
System.out.print(" 请输入第一个复数：a+bi(a和b均为实数)\n a = " ); BufferedReader dis1=new BufferedReader(new InputStreamReader(System.in)); double e=Double.parseDouble(dis1.readLine()); //System.out.println("Output Integer: "+e); //测试用的
System.out.print(" b = " ); BufferedReader dis2=new BufferedReader(new InputStreamReader(System.in)); double f=Double.parseDouble(dis2.readLine()); //System.out.println("Output Integer: "+f); //测试用的
System.out.print(" 请输入第二个复数：c+di(c和d均为实数)\n c = " ); BufferedReader dis3=new BufferedReader(new InputStreamReader(System.in)); double g=Double.parseDouble(dis3.readLine()); //System.out.println("Output Integer: "+g); //测试用的
System.out.print(" d = " ); BufferedReader dis4=new BufferedReader(new InputStreamReader(System.in)); double h=Double.parseDouble(dis4.readLine()); //System.out.println("Output Integer: "+h); //测试用的
Complex x1=new Complex(e,f); Complex x2=new Complex(g,h);
//加法测试 Complex y1=new Complex().AddComplex(x1,x2);
//减法测试 Complex y2=new Complex().SubComplex(x1,x2);
//乘法测试 Complex y3=new Complex().MulComplex(x1,x2);
//除法测试 Complex y4=new Complex().DivComplex(x1,x2);
//此处用的输出显示格式是(a+bi)+(c+di)=............. System.out.println("("+new Complex().toString(x1)+")"+"+" +"("+new Complex().toString(x2)+")"+"=" +new Complex().toString(y1));
System.out.println("("+new Complex().toString(x1)+")"+"-" +"("+new Complex().toString(x2)+")"+"=" +new Complex().toString(y2));
System.out.println("("+new Complex().toString(x1)+")"+"*" +"("+new Complex().toString(x2)+")"+"=" +new Complex().toString(y3));
System.out.println("("+new Complex().toString(x1)+")"+"/" +"("+new Complex().toString(x2)+")"+"=" +new Complex().toString(y4));
}
}
- 2楼网友：西岸风
- 2021-05-01 11:18
你安装的jdk是最新版本吧？
这些只是警告而已，编译照样还是成功的，运行也不会有问题的。