import java.util.*;
class Compare
{
public static void main(String[] args)
{
int[] x=new int[]{1,2};
int[] y=new int[]{1,2};
if(x.equals(y))
{
System.out.println(1);
}
else
{ System.out.println(2);
}
if(Arrays.equals(x,y))
{
System.out.println(3);
}
else
{ System.out.println(4);
}
}
}
结果为什么是2 ,3我看core java多维数组的例子时候,虽然最后看懂了,头都大了,不知道你们以前是否有和我一样的经历?
import java.text.*;
import javax.swing.*;
public class CompoundInterest
{
public static void main(String[] args)
{
final int STARTRATE = 10;
final int NRATES = 6;
final int NYEARS = 10; // set interest rates to 10 . . . 15%
double[] interestRate = new double[NRATES];
for (int j = 0; j < interestRate.length; j++)
interestRate[j] = (STARTRATE + j) / 100.0; double[][] balances = new double[NYEARS][NRATES]; // set initial balances to 10000
for (int j = 0; j < balances[0].length; j++)
balances[0][j] = 10000; // compute interest for future years
for (int i = 1; i < balances.length; i++)
{
for (int j = 0; j < balances[i].length; j++)
{
// get last year's balances from previous row
double oldBalance = balances[i - 1][j]; // compute interest
double interest = oldBalance * interestRate[j]; // compute this year's balances
balances[i][j] = oldBalance + interest;
}
} // print one row of interest rates
NumberFormat formatter= NumberFormat.getPercentInstance(); for (int j = 0; j < interestRate.length; j++)
{
System.out.println(" ");
System.out.println(formatter.format(interestRate[j]));
}
System.out.println(); // print balance table
formatter= NumberFormat.getPercentInstance();
for (int i = 1; i < balances.length; i++)
{
// print table row
for (int j = 0; j < balances[i].length; j++)
{
System.out.println(" ");
System.out.println(formatter.format( balances[i][j]));
}
System.out.println();
}
}
}
class Compare
{
public static void main(String[] args)
{
int[] x=new int[]{1,2};
int[] y=new int[]{1,2};
if(x.equals(y))
{
System.out.println(1);
}
else
{ System.out.println(2);
}
if(Arrays.equals(x,y))
{
System.out.println(3);
}
else
{ System.out.println(4);
}
}
}
结果为什么是2 ,3我看core java多维数组的例子时候,虽然最后看懂了,头都大了,不知道你们以前是否有和我一样的经历?
import java.text.*;
import javax.swing.*;
public class CompoundInterest
{
public static void main(String[] args)
{
final int STARTRATE = 10;
final int NRATES = 6;
final int NYEARS = 10; // set interest rates to 10 . . . 15%
double[] interestRate = new double[NRATES];
for (int j = 0; j < interestRate.length; j++)
interestRate[j] = (STARTRATE + j) / 100.0; double[][] balances = new double[NYEARS][NRATES]; // set initial balances to 10000
for (int j = 0; j < balances[0].length; j++)
balances[0][j] = 10000; // compute interest for future years
for (int i = 1; i < balances.length; i++)
{
for (int j = 0; j < balances[i].length; j++)
{
// get last year's balances from previous row
double oldBalance = balances[i - 1][j]; // compute interest
double interest = oldBalance * interestRate[j]; // compute this year's balances
balances[i][j] = oldBalance + interest;
}
} // print one row of interest rates
NumberFormat formatter= NumberFormat.getPercentInstance(); for (int j = 0; j < interestRate.length; j++)
{
System.out.println(" ");
System.out.println(formatter.format(interestRate[j]));
}
System.out.println(); // print balance table
formatter= NumberFormat.getPercentInstance();
for (int i = 1; i < balances.length; i++)
{
// print table row
for (int j = 0; j < balances[i].length; j++)
{
System.out.println(" ");
System.out.println(formatter.format( balances[i][j]));
}
System.out.println();
}
}
}
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int[] y=new int[]{1,2};这里x,y是不同的两个图像,x.equals(y)检测两个对象是否相等,建议你去看看《JAVA编程思想》,Arrays.equals(x,y)仅仅是对值的检测。
public static boolean equals(int[] a,
int[] a2) Stringequals
public boolean equals(Object anObject)数组中没有x.equals(y)这个写法,我说得对吧?
static boolean equals(int[] a, int[] a2)
如果两个指定的 int 型数组彼此相等,则返回 true。